C.R.S. § 16-3-102: Arrest by peace officer.

(1) A peace officer may arrest a person when:

(a) He has a warrant commanding that such person be arrested; or

(b) Any crime has been or is being committed by such person in his presence; or

(c) He has probable cause to believe that an offense was committed and has probable cause to believe that the offense was committed by the person to be arrested.

(2) A peace officer shall not knowingly arrest or knowingly participate in the arrest of any person who engages in a legally protected health-care activity, as defined in section 12-30-121 (1)(d), unless the acts forming the basis for the arrest constitute a criminal offense in Colorado.