Question to the Ministry of Justice:

To ask the Secretary of State for Justice, how many arrests have taken place on the prison estate in (a) total and (b) each prison in each year since 2010 for possession of (i) a novel psychoactive substance, (ii) a class A drug, (iii) a class B drug, (iv) a class C drug and (v) offensive weapons.

The information requested is not held centrally and could only be collected at disproportionate costs.