R.I. Gen. Laws § 21-28.6-18: Activities not exempt.

The provisions of this chapter do not exempt any person from arrest, civil or criminal penalty, seizure or forfeiture of assets, discipline by any state or local licensing board or authority, and state prosecution for, nor may they establish an affirmative defense based on this chapter to charges arising from, any of the following acts:

(1) Driving, operating, or being in actual physical control of a vehicle or a vessel under power or sail while impaired by marijuana or marijuana products;

(2) Possessing or using marijuana or marijuana products if the person is a prisoner;

(3) Possessing or using marijuana or marijuana products in any local detention facility, county jail, state prison, reformatory, or other correctional facility, including, without limitation, any facility for the detention of juvenile offenders; or

(4) Manufacturing or processing of marijuana products with the use of prohibited solvents, in violation of this chapter; or

(5) Possessing, using, distributing, cultivating, processing or manufacturing marijuana or marijuana products which do not satisfy the requirements of this chapter.