section 4(2)(b) of and Schedule 4 to the Misuse of Drugs Act 1971

Concerned in production of a controlled drug of Class B - cannabis

The statutory wording, points to prove, defences and penalty — verified against legislation.gov.uk (current revised versions, July 2026).

What the law says

Concerned in production of a controlled drug of Class B - cannabis — topic/offence reference under Contrary to section 4(2)(b) of and Schedule 4 to the Misuse of Drugs Act 1971..

CJS codes
Official CJS offence index (March 2026)
Charged under the specific underlying offence code.

Points to prove

  • 1. A controlled drug, namely cannabis (a Class B controlled drug), was produced by another person (production includes cultivation — s 37(1) MDA 1971)
  • 2. That production was in contravention of section 4(1) of the Misuse of Drugs Act 1971 (not authorised by regulations under s 7 or a licence)
  • 3. The defendant was concerned in that production by the other person (participation or identifiable involvement in the production enterprise)
  • 4. The defendant knew the nature of the enterprise, i.e. that it involved the production of a controlled drug (R v Hughes (1985) 81 Cr App R 344, applied to the 'concerned in' limbs)

Defences

  • Statutory defence — s 28(2) MDA 1971: the defendant proves he neither knew of, nor suspected, nor had reason to suspect the existence of some fact alleged by the prosecution which it is necessary for the prosecution to prove
  • Statutory defence — s 28(3)(b) MDA 1971: the defendant proves he neither believed nor suspected nor had reason to suspect that the substance was a controlled drug (or believed it to be a controlled drug of a description he could lawfully have dealt with)

Mode of trial & maximum penalty

Either way — Summary: 6/12 months' imprisonment and/or a fine; Indictment: 14 years' imprisonment

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Sources

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