The signing of a pleading or motion as required by the Texas Rules of Civil Procedure constitutes a certificate by the signatory that to the signatory's best knowledge, information, and belief, formed after reasonable inquiry:
(1) the pleading or motion is not being presented for any improper purpose, including to harass or to cause unnecessary delay or needless increase in the cost of litigation;
(2) each claim, defense, or other legal contention in the pleading or motion is warranted by existing law or by a nonfrivolous argument for the extension, modification, or reversal of existing law or the establishment of new law;
(3) each allegation or other factual contention in the pleading or motion has evidentiary support or, for a specifically identified allegation or factual contention, is likely to have evidentiary support after a reasonable opportunity for further investigation or discovery; and
(4) each denial in the pleading or motion of a factual contention is warranted on the evidence or, for a specifically identified denial, is reasonably based on a lack of information or belief.