There is nothing wrong with reporting criminals, even in an non-Muslim country

Is it permissible to call the police in a non-Islamic country against cannabis-hash breeders? While not knowing if all involved individuals are Muslims or not. Do different rulings apply in the case they are sinners or kufaar?
If its not permissible to call the police, what actions should be taken if you don’t believe talking to them to stop would be of any help. Their actions (making and selling hash) are of no direct harm/danger to me (but possibly will harm other people that buy them), but are not allowed by Islam ruling to be used in ways they intend to sell.
Also what ruling applies if above example occurred in an Islamic country, should one call the police?
(I tried to find an answer to my question using this website. It appears that it is not allowed to work for the police because they rule by laws other then those of Allah and his messenger, so it seems that calling the police would not be permissible in cases of little benefit or little danger, so it would probably be better not to call the police in the example I given, am I wrong in any of this?)