Vexatious search prohibition: officers must record written reasons before searches or detentions or face criminal penalty. The statute creates an offence where an authority or officer exercising powers under the Act conducts a search of premises or detains, searches or arrests a person without recording reasons in writing; conviction for each such offence attracts criminal sanctions, including imprisonment for a term which may extend to two years, a fine, or both, thereby imposing procedural safeguards and personal liability on officials.