25.—(1) Where with reasonable cause a member of the Garda Síochána suspects that an offence under section 15 of this Act has been committed and so suspects a person of having committed the offence, he may arrest the person without warrant.

(2) Where with reasonable cause a member of the Garda Síochána,

(a) suspects that an offence under this Act, other than an offence under section 15, has been committed or attempted, and

(b) suspects a person of having committed the offence or having made the attempt,

then if the member,

(c) with reasonable cause suspects that the person unless he is arrested either will abscond for the purposes of evading justice or will obstruct the course of justice, or

(d) having enquired of the person, has reasonable doubts as to the person's identity or place of abode, or

(e) having enquired of the person, knows that the person does not ordinarily reside in the State, or has reasonable doubts as to whether the person so resides,

he may arrest the person without warrant.