25 Procedure and evidence (1) In any criminal proceedings under this Act— (a) any quantity of seed in or upon any premises, place or vehicle at the time a sample thereof is taken under this Act shall, unless the contrary is proved, be deemed to possess the same properties as such sample; (b) any person who is proved to have tampered with any sample shall be deemed to have acted with fraudulent intent unless the contrary is proved; (c) a certificate stating the result of a test, examination or analysis carried out under the provisions of section fifteen, seventeen or eighteen and purporting to be signed by the seed analyst who carried out such test, examination or analysis shall be accepted as prima facie proof of the facts stated therein; (d) any statement or entry contained in any book or document kept by any importer, exporter or owner of seed, or by the manager, agent or employee of such person, or found upon or in any premises occupied by, or any vehicle used in, the business of such person, shall be admissible in evidence against him as an admission of the facts set forth in that statement or entry, unless it is proved that that statement or entry was not made by such person or by any manager, agent or employee of such person in the course of his agency or employment. (2) No prosecution shall be instituted as a result of any test, examination or analysis carried out in terms of the provisions of section fifteen, seventeen or eighteen unless a copy of the seed analyst’s certificate has been transmitted at least twenty-one days before the institution of such prosecution to the person who ts to be prosecuted. 26 Special defences in case of prosecutions It shall be a sufficient defence for a person charged with the sale of any seed in contravention of paragraph (a) of section ten if he proves to the satisfaction of the court— (a) that he purchased such seed from a person residing in Zimbabwe who had furnished him with a written warranty that such seed complied with the prescribed requirements; and (b) that he had no reason to believe that such seed did not so comply. 27 Acts or omissions by manager, agent or employee (1) Whenever any manager, agent or employee of any importer, exporter or owner of any seed does or omits to do any act which it would be an offence under this Act for such importer, exporter or owner to do or omit to do, then, unless it is proved that— (a) in doing or omitting to do that act the manager, agent or employee was acting without the connivance or the permission of the importer, exporter or owner; and (b) all reasonable steps were taken by the importer, exporter or owner to prevent any act or omission of the kind in question; and (c) it was not under any condition or in any circumstance within the scope of the authority or in the course of the employment of the manager, agent or employee to do or to omit to do acts, whether lawful or unlawful, of the character of the act or omission charged; the importer, exporter or owner, as the case may be, shall be presumed himself to have done or omitted to do that act and be liable to be convicted and sentenced in respect thereof, and the fact that he issued instructions forbidding any act or omission of the kind in question shall not, of itself, be accepted as sufficient proof that he took all reasonable steps to prevent the act or omission. (2) Whenever any manager, agent or employee of an importer, exporter or owner of any seed does or omits to do an act which it would be an offence under this Act for the importer, exporter or owner to do or omit to do, he shall be liable to be convicted