These Rules amend the Prison Rules 1999 (S.I. 1999/728) (“the 1999 Rules”) and the Young Offender Institution Rules 2000 (S.I. 2000/3371) (“the 2000 Rules”). These Rules amend the definition of “specified drug” in rule 2(1) of the 1999 Rules and rule 2(1) of the 2000 Rules. Products or substances that fall within those definitions are “specified drugs” for the purposes of section 16A (testing prisoners for drugs) of the Prison Act 1952 (c. 52) (“the Act”). The effect of section 16A of the Act is that a prison officer can require a prisoner or an inmate to provide a sample for the purposes of ascertaining whether there is a specified drug in the body of the prisoner or inmate. These Rules make a minor amendment to clarify that a “specified drug” is a product or substance that contains one or more of the chemical compounds listed in the definitions. In addition, these Rules amend the definitions of “specified drug” to include a number of additional chemical compounds.