Black Tar Heroin: The Dark End of the Street is a 1999 documentary directed by Steven Okazaki. Filmed from 1995 to 1998 in the Tenderloin, San Francisco, California, the documentary describes the lives of heroin addicts.
The film follows a simple structure, and shows the drug-related degradation of five youths (Jake, Tracey, Jessica, Alice, Oreo) during the course of three years. The film depicts their drug-related crimes and diseases: prostitution, male prostitution, AIDS, and lethal overdoses.
In a 2004 follow up interview with Tracey, she reveals she is now a full-time drug counselor, while Jessica is still working as a prostitute despite having HIV. Alice is believed to be sober since 2002. Oreo's whereabouts are unknown; his girlfriend Jennifer went to treatment, when she relapsed shortly after she got out she died from an asthma attack while in a "drug house". She gasped for air for 40 mins (and nobody helped her) before she died. Jake overcame his heroin addiction and began methadone treatment. Shortly after stopping his methadone and the break-up with his first clean and sober girlfriend, Jake was found dead of a drug overdose in January 2002. Tracey's boyfriend, Ben, died of an overdose just one week after being released from prison on a burglary charge.
In a further update on YouTube, Tracey revealed she had earned a master's degree, married and become a mother to three kids; as of July 2015 update, she stated she was 16 years clean. She has written one book already and has a second one on the way. Tracey works in the community she used to use drugs in, helping those who suffer from addiction.
More info in Wikipedia.