<PAGE>

                                                                    EXHIBIT 31.1

                              FORM OF CERTIFICATION
                       PURSUANT TO RULE 13A-14 AND 15D-14
              UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

                                  CERTIFICATION

         I, Joseph M. Cummins, certify that:

         1. I have reviewed this quarterly report on Form 10-QSB of Amarillo
Biosciences, Inc.;

         2. Based on my knowledge, this quarterly report does not contain any
untrue statement of material fact or omit to state a material fact necessary to
make the statements made, in light of the circumstances under which such
statements were made, not misleading with respect to the period covered by this
quarterly report;

         3. Based on my knowledge, the financial statements, and other financial
information included in this quarterly report, fairly present in all material
respects the financial condition, results of operations and cash flows of the
registrant as of, and for, the periods presented in this quarterly report;

         4. I am responsible for establishing and maintaining disclosure
controls and procedures (as defined in Exchange Act Rules 13a-14 and 15d-14) for
the registrant and have:

                (a) designed such disclosure controls and procedures to ensure
that material information relating to the registrant, including its consolidated
subsidiaries, is made known to us by others within those entities, particularly
during the period in which this quarterly report is being prepared;

                (b) evaluated the effectiveness of the registrant's disclosure
controls and procedures as of a date within 90 days of the filing date of this
quarterly report (the "Evaluation Date"); and

                (c) presented in this quarterly report our conclusions about the
effectiveness of the disclosure controls and procedures based on our evaluation
as of the Evaluation Date;

         5. As the registrant's certifying officer I have disclosed, based on
the most recent evaluation, to the registrant's auditors and the audit committee
of the registrant's board of directors (or persons performing the equivalent
functions):

                (a) all significant deficiencies in the design or operation of
internal controls which could adversely affect the registrant's ability to
record, process, summarize, and report financial data and have identified for
the registrant's auditors any material weaknesses in internal controls; and

                (b) any fraud, whether or not material, that involves management
or other employees who have a significant role in the registrant's internal
controls.

         6. I have indicated in this quarterly report whether or not there were
significant changes in internal controls or in other factors that could
significantly affect internal controls subsequent to the date of our most recent
evaluation, including any corrective actions with regard to significant
deficiencies and material weaknesses.


Date: August 13, 2003                 /s/ Joseph M. Cummins
                                      -----------------------------------------
                                      Name:  Joseph M. Cummins
                                      Title: President, Chief Executive Officer
                                             and Chief Financial Officer