That is BS. Those in prison for drug crimes didn't get there for an ounce or two of pot for personal use. Any there for having pot for personal use had a rap sheet longer than your arm already, and likely were busted for probation violations.
On which the law enforcement system has already had its say - so how is it relevant to their having pot for personal use?
and likely were busted for probation violations.
Have any evidence that this is likely (rather than merely possible)?