> As far as i know for my town, Paderborn (NRW), we have about 1.000 people receiving opioid replacement drugs under government supervision (~90.000 city population).

Whoa, that's an outsized proportion - entire Germany has 77k people in methadone substitution: http://www.bfarm.de/SharedDocs/Downloads/DE/Bundesopiumstell...

Also, the numbers are 500 methadone substituters (of total ~1k opiate users) in Paderborn (http://www.nw.de/lokal/kreis_paderborn/paderborn/paderborn/1...). What would interest me is the background why ~1% of the population are opiate abusers, though.