Section 4 of the POHA lays down the offence of using threatening, abusive or insulting words or behaviour; or making any threatening, abusive or insulting communication which is heard, seen or otherwise perceived by any person (“the victim”) likely to be caused harassment, alarm or distress. Under s 4(3)(a), it is a defence for the accused person to prove that he had no reason to believe the victim would hear, see or otherwise perceive the word or behaviour used, or the communication made. Similar to s 3(3), s 4(3)(b) also states that it is a defence for the accused person to prove that his conduct was reasonable.