Do people who have gone to jail because of taking drugs have to go to a drug treatment program afterwards?

I was just wondering whether their time in jail is enough, since when they are locked up in jail, they won't be able to get access to drugs.

: http://alcoholdrugstreatment.info/do-people-who-have-gone-to-jail-because-of-taking-drugs-have-to-go-to-a-drug-treatment-program-afterwards