Any constable may arrest without warrant any person F1who he has reasonable grounds to suspect is committing, has committed or is about to commit a scheduled offence or an offence under this Act which is not a scheduled offence.

For the purposes of arresting a person under this section a constable may enter and search any premises or other place where that person is or where the constable F2has reasonable grounds for suspecting him to be.

A constable may seize anything which he F3has reasonable grounds to suspect is being, has been or is intended to be used in the commission of a scheduled offence or an offence under this Act which is not a scheduled offence.