Users tend to bring their own seeds and grow their own without telling anyone so they don't have to use dealers.

There is basically no checking at customs for anything other than alcohol (which is available here in limited quantities to expats anyway). There is no random drug screening at the airport, and no testing for it in the RP process.

Contrary to what a few naive people in this forum may believe, illicit drug use is reasonably common here amongst locals and expats, it's just not spoken of.

Zero tolerance means you're in deep sh1t if you're caught, but the local constabulary does little more than traffic control in this place.