Mex. Cartels are here, on Maui.  
Informed my son about Cartels 
and use of blacktar - heroin. Son is on MPD, noticed presence of tar when they make drug arrest.  Usually Mexicans use the tar and is 
 also an indication of undocumented people in your community. Cartels work through Mexican Mafia as distributors. Mafia in turn work with Samoans from Cali. as distributors here, via extended families here . Relationship between Samoans and Mexicans established in California prisons. All started in the late 90's.