Wyo. Stat. § 7-2-102

(a) A peace officer may arrest a person when the officer
has a warrant commanding that the person be arrested or the
officer has reasonable grounds for believing that a warrant for
the person's arrest has been issued in this state or in another
jurisdiction.

     (b)   A peace officer may arrest a person without a warrant
when:

          (i) Any criminal offense is being committed in the
officer's presence by the person to be arrested;

          (ii) The officer has probable cause to believe that a
felony has been committed and that the person to be arrested has
committed it; or

          (iii) The officer has probable cause to believe that
a misdemeanor has been committed, that the person to be arrested
has committed it and that the person, unless immediately
arrested:

                (A)   Will not be apprehended;
               (B) May cause injury to himself or others or
damage to property; or

               (C) May destroy or conceal evidence of the
commission of the misdemeanor.