Several Botulism Cases In LA Possibly Linked To Black Tar Heroin Use Posted on July 3, 2018 by Los Angeles 1 Los Angeles Los Angeles News & Search 1 News - 1 eMovies - 1 eMusic - 1 eBooks - 1 Search Search for: Black tar heroin use could be the cause of several botulism cases in Los Angeles County. Matt Yurus reports. 1 Los Angeles Los Angeles News & Search 1 News - 1 eMovies - 1 eMusic - 1 eBooks - 1 Search Search for: