Drug Rehabilitation that works

It wasn’t heroin; it was an ingredient in ecstacy
It wasn’t heroin, it was 3,4-methylenedioxymethamphetamine.
Read more on Kewanee Star Courier

Search warrant yields heroin, arrests
Officers with the Eureka Police Department’s Problem Oriented Policing Unit executed a search warrant Tuesday on a vehicle near 7th and H streets in Eureka, believed to be involved in a heroin sales investigation.
Read more on Eureka Times-Standard

From my understanding, diet pills used to contain speed (methamphetamine) to help people lose weight. Do they still do it or is it illegal now? If so, what is the “active ingredient” used in them now instead?