I got an idea for drugs: you grow them as you would with the regular drug mod, but instead of selling them on a brick, you sell them by leaving the city. This can be done in one of three ways: by sea (seaport), air (airport), or ground (boarder crossing).
The challenge is getting your drugs to one of these "exits" without a cop stopping you for a "contraband search" (probably done by a cop clicking on you with some sort of item, such as a rubber glove). If they find you are carrying drugs, you get arrested for however long you would be for selling them on the old drug mod's brick.
If you make it to one of the exits, you either:
a. enter a teleporter brick or,
b. click a setplayertransform brick.
You then spawn outside of the city (call it whatever you want) where cops can't go, sell your drugs (to a black market) and go back with your score!
The following is optional, as it is much more complicated, and requires casinos:
When you get back to the city, the money you scored is now "dirty money." This is considered contraband because money used to buy drugs is often stolen or counterfeit. You cannot directly deposit this money into the bank in its current state. You need to "launder" this money by:
a. buying stuff (food, items, lots), or
b. gambling it in a casino (casino cash is always dirty).
Otherwise, great job so far!