Exhibit 10.18
                                   -------------



Citizens

           Bank' Investments.Trust. Insurance www.citizensnational.net

PROMISSORY NOTE


           References in the shaded area are for Lender's use only and
     do not limit the applicability of this document to any particular loan
        or item. Any item above containing "***" has been omitted due to
                            text length limitations.

Borrower_

REMOTEMDX, INC.
150 W CIVIC CENTER DRIVE SUITE 400 SANDY,UT 84070

lender:

Citizens National Bank Main Office
127 S Side Square P.O. Box 1279 Macomb,IL 61455

Principal Amount: $2,000,000.00 Initial Rate: 8.000% Date of Note: June 26, 2006

PROMISE  TO  PAY.  REMOTEMDX,  INC.  ("Borrower")  promises  to pay to  Citizens
National  Bank  ("Lender"),  or order,  in lawful money of the United  States of
America, the principal amount of Two Million & 00/100 Dollars ($2,000,000.00) or
so much as may be outstanding,  together with interest on the unpaid outstanding
principal balance of each advance. Interest shall be calculated from the date of
each advance until repayment of each advance.
PAYMENT. Borrower will pay this loan in one payment of all outstanding principal
plus all accrued  unpaid  interest on June 30, 2007. In addition,  Borrower will
pay  regular  monthly  payments of all accrued  unpaid  interest  due as of each
payment date, beginning August 1, 2006, with all subsequent interest payments to
be due on the same day of each month  after  that.  Unless  otherwise  agreed or
required by applicable law, payments will be applied first to any accrued unpaid
interest; and then to principal.  Interest on this Note is computed on a 365/365
simple  interest  basis;  that is, by applying the ratio of the annual  interest
rate over the number of days in a year,  multiplied by the outstanding principal
balance,  multiplied  by the  actual  number of days the  principal  balance  is
outstanding. Borrower will pay Lender at Lender's address shown above or at such
other place as Lender may designate in writing.
VARIABLE INTEREST RATE. The interest rate on this Note is subject to change from
time to time based on changes in an independent index which is the Prime Rate as
published in The Wall Street Journal (the "Index"r. The Index is not necessarily
the lowest rate charged by Lender on its loans. If the Index becomes unavailable
during the term of this loan,  Lender may  designate  a  substitute  index after
notifying  Borrower.  Lender  will tell  Borrower  the  current  Index rate upon
Borrower's request. The interest rate change will not occur more often than each
day.  Borrower  understands  that  Lender may make loans based on other rates as
well. The Index  currently is 8.000% per annum.  The interest rate to be applied
to the unpaid principal  balance during this Note will be at a rate equal to the
Index,  resulting  in an  initial  rate of 8.000% per  annum.  NOTICE:  Under no
circumstances  will the interest rate on this Note be more than the maximum rate
allowed by applicable law.
PREPAYMENT;  MINIMUM  INTEREST  CHARGE.  Borrower  agrees that all loan fees and
other  prepaid  finance  charges are earned fully as of the date of the loan and
will not be subject to refund  upon early  payment  (whether  voluntary  or as a
result of default), except as otherwise required by law. In any event, even upon
full prepayment of this Note, Borrower  understands that Lender is entitled to a
minimum interest charge of $100.00.  Other than Borrower's obligation to pay any
minimum  interest  charge,  Borrower may pay without penalty all or a portion of
the amount owed earlier than it is due. Early  payments will not,  unless agreed
to by Lender in writing,  relieve Borrower of Borrower's  obligation to continue
to make payments of accrued unpaid interest.  Rather, early payments will reduce
the principal  balance due.  Borrower  agrees not to send Lender payments marked
"paid in full", "without recourse",  or similar language. If Borrower sends such
a payment, Lender may accept it without losing any of Lender's rights under this
Note,  and  Borrower  will remain  obligated  to pay any further  amount owed to
Lender. All written  communications  concerning disputed amounts,  including any
check or other payment  instrument  that indicates that the payment  constitutes
"payment in full" of the amount owed or that is tendered  with other  conditions
or limitations or as full  satisfaction  of a disputed  amount must be mailed or
delivered to: Citizens National Bank, Main Office,  127 S Side Square,  P.O. Box
1279, Macomb, IL 61455.
LATE  CHARGE.  If a payment  is 10 days or more late,  Borrower  will be charged
5.000% of the regularly scheduled payment or $25.00, whichever is less.
INTEREST  AFTER  DEFAULT.  Upon  default,  including  failure  to pay upon final
maturity,  the  interest  rate on this Note shall be  increased  to 15.000%  per
annum.  However,  in no event will the interest rate exceed the maximum interest
rate  limitations  under  applicable law.  DEFAULT.  Each of the following shall
constitute  an event of default  ("Event of Default")  under this Note:  Payment
Default.  Borrower  fails to make any  payment  when due under this Note.  Other
Defaults.  Borrower  fails  to  comply  with  or  to  perform  any  other  term,
obligation,  covenant  or  condition  contained  in  this  Note or in any of the
related documents or to comply with or to perform any term, obligation, covenant
or condition contained in any other agreement between Lender and Borrower.
False Statements. Any warranty, representation or statement made or furnished to
Lender by  Borrower  or on  Borrower's  behalf  under  this Note or the  related
documents is false or misleading in any material  respect,  either now or at the
time made or furnished or becomes false or misleading at any time thereafter.
Insolvency.  The  dissolution or termination of Borrower's  existence as a going
business, the insolvency of Borrower, the appointment of a receiver for any part
of Borrower's property, any assignment for the benefit of creditors, any type of
creditor workout,  or the commencement of any proceeding under any bankruptcy or
insolvency laws by or against Borrower.
Creditor or Forfeiture  Proceedings.  Commencement  of foreclosure or forfeiture
proceedings,  whether by judicial  proceeding,  self-help,  repossession  or any
other method, by any creditor of Borrower or by any governmental  agency against
any  collateral  securing  the  loan.  This  includes  a  garnishment  of any of
Borrower's  accounts,  including deposit accounts,  with Lender.  However,  this
Event of Default shall not apply if there is a good faith dispute by Borrower as
to the  validity  or  reasonableness  of the  claim  which  is the  basis of the
creditor or forfeiture proceeding and if Borrower gives Lender written notice of
the  creditor or  forfeiture  proceeding  and deposits  with Lender  monies or a
surety bond for the creditor or forfeiture  proceeding,  in an amount determined
by Lender, in its sole discretion,  as being an adequate reserve or bond for the
dispute.
Events Affecting  Guarantor.  Any of the preceding events occurs with respect to
any  guarantor,   endorser,  surety,  or  accommodation  party  of  any  of  the
indebtedness or any guarantor,  endorser, surety, or accommodation party dies or
becomes incompetent, or revokes or disputes the validity of, or liability under,
any  guaranty  of the  indebtedness  evidenced  by this Note.  In the event of a


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loan No: 400949881

                           PROMISSORY NOTE {Continued}

Page 2

death,  Lender,  at its option,  may, but shall not be required  to,  permit the
guarantor's estate to assume  unconditionally  the obligations arising under the
guaranty in a manner satisfactory to Lender, and, in doing so, cure any Event of
Default.
Change In  Ownership.  Any change in ownership of  twenty-five  percent (25%) or
more of the common stock of Borrower.  Adverse Change. A material adverse change
occurs in Borrower's  financial  condition,  or Lender  believes the prospect of
payment or performance of this Note is impaired.
Insecurity. Lender in good faith believes itself insecure.
LENDER'S  RIGHTS.  Upon default,  Lender may declare the entire unpaid principal
balance under this Note and all accrued  unpaid  interest  immediately  due, and
then Borrower will pay that amount.
ATTORNEYS' FEES;  EXPENSES.  Lender may hire or pay someone else to help collect
this Note if Borrower does not pay.  Borrower will pay Lender that amount.  This
includes,  subject to any limits under applicable law, Lender's  attorneys' fees
and  Lender's  legal  expenses,  whether  or not there is a  lawsuit,  including
attorneys'  fees,  expenses for  bankruptcy  proceedings  (including  efforts to
modify  or  vacate  any  automatic  stay or  injunction),  and  appeals.  If not
prohibited  by  applicable  law,  Borrower  also  will pay any court  costs,  in
addition to all other sums provided by law.
JURY WAIVER. Lender and Borrower hereby waive the right to any jury trial in any
action, proceeding, or counterclaim brought by either Lender or Borrower against
the other.
GOVERNING  LAW.  This Note will be governed by federal law  applicable to Lender
and,  to the  extent not  preempted  by  federal  law,  the laws of the State of
Illinois  without regard to its conflicts of law provisions.  This Note has been
accepted by Lender in the State of Illinois.
CHOICE OF VENUE. If there is a lawsuit, Borrower agrees upon Lender's request to
submit to the jurisdiction of the courts of McDonough County, State of Illinois.
RIGHT OF SETOFF.  To the extent  permitted by applicable  law, Lender reserves a
right of  setoff in all  Borrower's  accounts  with  Lender  (whether  checking,
savings,  or some other  account).  This  includes all accounts  Borrower  holds
jointly  with  someone  else and all  accounts  Borrower may open in the future.
However,  this does not include any IRA or Keogh accounts, or any trust accounts
for which setoff would be prohibited by law. Borrower  authorizes Lender, to the
extent  permitted by  applicable  law, to charge or setoff all sums owing on the
indebtedness against any and all such accounts.
COLLATERAL.  Borrower  acknowledges  this  Note  is  secured  by  the  following
collateral described in the security instruments listed herein:

(A)  inventory,  chattel  paper,  accounts,  equipment  and general  intangibles
described in Commercial Security Agreements dated June 26, 2006.

(B) deposit  accounts  described in an Assignment of Deposit  Account dated June
26, 2006.

LINE OF CREDIT.  This Note evidences a revolving line of credit.  Advances under
this Note may be  requested  only in writing by  Borrower or as provided in this
paragraph.  All  communications,  instructions,  or  directions  by telephone or
otherwise  to Lender are to be directed  to Lender's  office  shown  above.  The
following person currently is authorized,  except as provided in this paragraph,
to request advances and authorize payments under the line of credit until Lender
receives  from  Borrower,  at Lender's  address shown above,  written  notice of
revocation of his or her authority:  DAVID DERRICK,  Chief Executive  Officer of
REMOTEMDX,  INC.  Draws to be taken on approved  invoices  presented to Citizens
National Bank from the following companies: CP Baker Securities, Inc, RemoteMDx,
Inc.,  Dynamic Source  Manufacturing  and Advanta Design Group,  Inc. Lender may
advance funds under this note to iii pay itself interest,  (m make deposits into
the  Account  (as  defined   below)  if  it  contains  less  than  the  required
compensating  balance,  and (im to pay itself fees and other amounts that may be
owed to it.  Borrower  agrees to be liable for all sums either:  (A) advanced in
accordance with the instructions of an authorized  person or (B) credited to any
of Borrower's  accounts with Lender.  The unpaid principal balance owing on this
Note at any time may be  evidenced by  endorsements  on this Note or by Lender's
internal  records,  including  daily  computer  print-outs.  Lender will have no
obligation to advance funds under this Note if: (A) Borrower or any guarantor is
in default  under the terms of this Note or any  agreement  that Borrower or any
guarantor has with Lender,  including any agreement made in connection  with the
signing of this Note; (B) Borrower or any guarantor  ceases doing business or is
insolvent;  (C) any  guarantor  seeks,  claims or  otherwise  attempts to limit,
modify or revoke such guarantor's  guarantee of this Note or any other loan with
Lender;  (D)  Borrower  has  applied  funds  provided  pursuant to this Note for
purposes  other than  those  authorized  by Lender;  or (E) Lender in good faith
believes itself insecure.
ADDITIONAL  REQUIREMENTS.  Lender will require  borrower to open their operating
deposit  account and research and  development  account at lenders  institution.
Lender will require quarterly profit and loss statements, business balance sheet
and annual tax returns from borrower. Lender will require an amount equal to 10%
of the line of credit as  compensating  balance in the operating  account.  Lock
Box: Lender will provide a PO Box  specifically  for borrower lock box purposes.
Lender will provide daily emails  including  scanned  images of all checks being
deposited.  In addition to and not in  limitation  of other  rights of Lender to
payment,  twenty-five (25) percent of all deposits received into the Account (as
defined in the Assignment of Deposit Account described above) will be applied to
the operating  line of credit and  seventy-five  (75) percent will remain in the
borrowers operating deposit account.
LETTER OF CREDIT.  In addition to the other  collateral for this Note,  Borrower
acknowledges  and agrees that this Note is secured by a Letter of Credit  issued
to Lender on its behalf by United States Trust Company, N.A. dated June 26, 2006
Lender  shall  return  the  letter(s)  of  credit  securing  the loan  after the
applicable  preference  period  following the occurence of both of the following
(i) payment in full of all amounts  payable to Lender under the Note and related
documents  and  (ii)  Borrower's  acknowledgment  that  Lender  has  no  further
obligation  to loan amounts to Borrower  pursuant to such  documents.
SUCCESSOR INTERESTS.  The terms of this Note shall be binding upon Borrower, and
upon Borrower's heirs,  personal  representatives,  successors and assigns,  and
shall inure to the benefit of Lender and its successors and assigns.
GENERAL PROVISIONS.  If any part of this Note cannot be enforced, this fact will
not affect the rest of the Note.  Lender may delay or forgo enforcing any of its
rights or remedies under this Note without  losing them.  Borrower and any other
person who signs,  guarantees or endorses  this Note,  to the extent  allowed by
law, waive  presentment,  demand for payment,  and notice of dishonor.  Upon any
change in the terms of this  Note,  and  unless  otherwise  expressly  stated in
writing,   no  party  who  signs  this  Note,   whether  as  maker,   guarantor,
accommodation  maker or endorser,  shall be released  from  liability.  All such
parties agree that Lender may renew or extend  (repeatedly and for any length of
time) this loan or release any party or guarantor or collateral; or impair, fail
to realize upon or perfect  Lender's  security  interest in the collateral;  and
take any other  action  deemed  necessary  by Lender  without  the consent of or
notice to anyone.  All such  parties also agree that Lender may modify this loan
without  the  consent of or notice to anyone  other than the party with whom the
modification is made. The obligations under this Note are joint and several.
ILLINOIS INSURANCE NOTICE.  Unless Borrower provides Lender with evidence of the
insurance  coverage  required by Borrower's  agreement  with Lender,  Lender may
purchase  insurance at Borrower's  expense to protect Lender's  interests in the
collateral. This insurance may, but need

<PAGE>

Loan No: 400949881

                           PROMISSORY NOTE (Continued)

Page 3

not, protect  Borrower's  interests.  The coverage that lender purchases may not
pay any claim that Borrower makes or any claim that is made against  Borrower in
connection  with  the  collateral.  Borrower  may  later  cancel  any  insurance
purchased by lender, but only after providing lender with evidence that Borrower
has  obtained  insurance  as required by their  agreement.  If lender  purchases
insurance for the collateral, Borrower will be responsible for the costs of that
insurance,  including  interest  and any  other  charges  lender  may  impose in
connection with the placement of the insurance,  until the effective date of the
cancellation  or expiration of the insurance.  The costs of the insurance may be
added to Borrower's total  outstanding  balance or obligation.  The costs of the
insurance may be more than the cost of insurance  Borrower may be able to obtain
on Borrower's own.

PRIOR TO SIGNING THIS NOTE,  BORROWER READ AND  UNDERSTOOD All THE PROVISIONS OF
THIS NOTE,  INCLUDING THE VARIABLE INTEREST RATE PROVISIONS.  BORROWER AGREES TO
THE TERMS OF THE NOTE. BORROWER ACKNOWLEDGES RECEIPT OF A COMPLETED COpy OF THIS
PROMISSORY NOTE.

BORROWER:

REMOTEMDX, INC.

Executive

Officer

of

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