The Water Environment (Controlled Activities) (Scotland) Regulations 2005

12.  In the case of any such article or substance as is mentioned in paragraph 11, to take possession of it and detain it for so long as is necessary for all or any of the following purposes namely:

(a) to examine it, or cause it to be examined, and to do, or cause to be done, to it anything which that person has power to do under that paragraph;

(b) to ensure that it is not tampered with before examination of it is completed;

(c) to ensure that it is available for use as evidence in any proceedings for an offence under these Regulations or in any other proceedings relating to a variation notice, revocation or suspension notice or enforcement notice under these Regulations.