Anyone think weed is a magical herb?

I find that drugs, specially weed, are transferable from one form into another. That means, an adult (not me), can change the effects of the weed, from highly positive to highly negative within 6 months. That’s why weed can sometimes be called as grass, that could mean it can be converted into cow-dung.

I’ve seen weed strain change from black to brown to green to black and to negative patched strains within 2 years.

Any suggestions if the government is doing this? Any Science on how to alter and grow your favourite strain on your own?