6:

|HERBERT M. JONES
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      JOSEPH W. BROWN
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      CLARK V. VELLIS
      JOHN P. DESMOND | JONESVARGASATTORNEYS AT LAW
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      LAS VEGAS, NEVADA 89109TEL (702) 862-3300 FAX(702) 734-2722
      
      WWW.JONESVARGAS.COM | CLIFFORD A. JONES (1912 - 2001)
      GEORGE L. VARGAS (1909 - 1985)
      JOHN C. BARTLETT (1910 - 1982)
      LOUIS MEAD DIXON (1919 - 1993)
      GARY T. FOREMASTER (1953 - 1998)OF COUNSEL
      DOUGLAS G. CROSBY
      
      
      
      BRIAN J. MATTER
      EXECUTIVE DIRECTOR
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|                                                                                                                                                                                                                                                                                                                                                                                                                                        | July 10, 2003                                                                                                                                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                        
|DAVID A. CARROLL
      ANDI S. CHANG
      ELIZABETH M. FIELDER
      TROY C. FUHRIMAN
      EDWARD M. GARCIA
      ELIZABETH M. GHANEM
      RORY A. GOODE
      RYAN W. HERRICK
      JENNIFER SLOAN HILSABECK
      BRIAN R. IRVINE
      TAMARA BEATTY PETERSON
      MOLLY MALONE REZAC                                                                                                                                            | KRISANNE M. SCHLACHTER*
      SCOTT M. SCHOENWALD
      BRETT J. SCOLARI
      STEVEN G. SHEVORSKI
      ARIEL E. STERN
      STEPHEN M. SULLIVAN
      TIFFANY J. SWANIS
      BRADLEY R. TATOM
      AMY N. TIRRE
      NICOLE MOSCHETTI VANCE**
      GORDON H. WARREN                                                                                                                                                                            | PETE ERNAUT***
      MANAGING DIRECTOR
      GOVERNMENT AFFAIRS
      AND PUBLIC POLICY                                                                                                
|                                                                                                                                                                                                                                                                                                                                                                                                                                       
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Lifestream Technologies, Inc. Exhibit 5.1

5120 Clearwater Loop

Suite 101

Post Falls, Idaho 83854

Re: Lifestream Technologies, Inc. --  Registration Statement on Form S-3 in

respect of 36,335,890 Shares of Common Stock, par value $0.001 per
share

Ladies and Gentlemen:

We have acted as special Nevada counsel to Lifestream
Technologies, Inc., a Nevada corporation (the "Company"), in connection with the
filing by the Company of a Registration Statement on Form S-3 (the "Registration
Statement") with the Securities and Exchange Commission under the Securities Act
of 1933 with respect to the offer and sale of up to 36,335,890 shares (the
"Shares") of the Company's Common Stock, par value $0.001 per share, which may
be offered for sale from time to time by certain stockholders of the Company
identified in the prospectus forming part of the Registration Statement.



In our capacity as such counsel, we are familiar with the
proceedings taken by the Company in connection with the authorization, issuance
and sale of the Shares. In addition, we have made such legal and factual
examinations and inquiries, including an examination of originals (or copies
certified or otherwise identified to our satisfaction as being true
reproductions of originals) of such documents, corporate records and other
instruments, and have obtained such certificates and other representations and
assurances, as we have deemed necessary or appropriate for the purposes of this
opinion.



In such examination, we have assumed the genuineness of all
signatures, the authenticity of all documents submitted to us as originals, the
legal capacity of natural persons executing such documents and the authenticity
and conformity to original documents of documents submitted to us as certified,
photostatic, facsimile or electronically transmitted copies.



Based upon the foregoing and the proceedings taken by the
Company referred to above, we are of the opinion that the Shares have been duly
authorized and are validly issued, fully paid and nonassessable.



Our opinion herein is limited to the effect on the subject
transactions of the laws of the State of Nevada as in effect on the date hereof.
We assume no responsibility regarding the applicability to such transactions, or
the effect thereon, of the laws of any other jurisdiction.



We consent to your filing this opinion as an exhibit to the
Registration Statement and to the reference to our firm contained under the
heading "Legal Matters" in the prospectus included therein.



Very truly yours,





Jones Vargas