EXHIBIT 31.1
CERTIFICATION
PRINCIPAL EXECUTIVE OFFICER
AND
PRINCIPAL FINANCIAL OFFICER
I, J. Scott Zimmerman, certify that:
1. I have reviewed this Quarterly Report
on Form 10-Q of South Texas Oil Company;
2. Based on my knowledge, this report
does not contain any untrue statement of a 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 report;
3. Based on my knowledge, the financial
statements, and other financial information included in this 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 report;
4. The registrant's other certifying
officer and I are responsible for establishing and maintaining
disclosure controls and procedures (as defined in Exchange Act
Rules 13a-15(e) and 15d-15(e)) and internal control over financial
reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for
the registrant and have:
a) Designed such disclosure
controls and procedures, or caused such disclosure controls and
procedures to be designed under our supervision, 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
report is being prepared;
b) Designed such internal control
over financial reporting, or caused such internal control over
financial reporting to be designed under our supervision, to
provide reasonable assurance regarding the reliability of
financial reporting and the preparation of financial statements
for external purposes in accordance with generally accepted
accounting principles;
c) Evaluated the effectiveness of
the registrant's disclosure controls and procedures and presented
in this report our conclusions about the effectiveness of the
disclosure controls and procedures, as of the end of the period
covered by this report based on such evaluation; and
d) Disclosed in this report any
change in the registrant's internal control over financial
reporting that occurred during the registrant's most recent fiscal
quarter (the registrant's fourth fiscal quarter in the case of an
annual report) that has materially affected, or is reasonably
likely to materially affect, the registrant's internal control
over financial reporting; and
5. I have disclosed, based on our most
recent evaluation of internal control over financial reporting, 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 and
material weaknesses in the design or operation of internal control
over financial reporting which are reasonably likely to adversely
affect the registrant's ability to record, process, summarize and
report financial information; and
b) Any fraud, whether or not
material, that involves management or other employees who have a
significant role in the registrant's internal control over
financial reporting.
Date: May 20, 2008 /s/ J. Scott Zimmerman
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J. Scott Zimmerman
Chief Executive Officer
(Principal Executive Officer and
Principal Financial Officer)