I'm gonna call it mate and believe me if I am wrong I am really fucking sorry but this does not sound plausible for 20 grams, you are describing a major police investigation and surveillance effort, I cannot imagine a police force anywhere with the inclination, time or care-factor to mount such an operation, if it was 20 kilos that would be different. Seriously mate, I think you are either having a major case of the noya or some seriously weird shit is going on, maybe get out of town for a few days and chill out.