7Arrest, search and seizure
(1)A constable who suspects with reasonable cause that a person has committed or is committing an offence under this Act may without warrant—
(a)arrest that person;
(b)stop and search that person, if the constable suspects with reasonable cause that evidence in connection with the offence is to be found on that person;
(c)search or examine a vehicle, animal or article which appears to belong to, or be in the possession or control of, that person, if the constable suspects with reasonable cause that evidence in connection with the offence is to be found in or on it;
(d)seize and detain for the purpose of proceedings under this Act a vehicle, animal or article which may be evidence in connection with the offence or which may be made the subject of an order under Part II of the Proceeds of Crime (Scotland) Act 1995 (c. 43).
(2)A vehicle, animal or article seized under subsection (1)(d) above shall be returned to the person from whom it was seized as soon as any proceedings under this Act are concluded without the conviction of the person accused.
(3)A constable may enter land (but not a dwelling house) in order to exercise a power given by subsection (1).