(a) The person knowingly subjects another person to an act of sexual penetration by compulsion;

(b) The person knowingly subjects to sexual penetration another person who is mentally defective, mentally incapacitated, or physically helpless;

(c) The person, while employed in a state correctional facility or while employed as a law enforcement officer as defined in section 710-1000(13), knowingly subjects to sexual penetration an imprisoned person, a person confined to a detention facility, or a person in custody; provided that paragraph (b) and this paragraph shall not be construed to prohibit practitioners licensed under chapter 453, 455, or 460, from performing any act within their respective practices; and further provided that this paragraph shall not be construed to prohibit a law enforcement officer from performing a lawful search pursuant to a warrant or exception to the warrant clause.