I remember reading a few years back that bags of marijuana that had been seized from dealers in the UK had been weighed down with tiny beads of glass to give it more monetary value. There was quite a bit of speculation about the possibility of someone having their throat cut accidentally, should they inhale any of this glass. Another problem mentioned was that many dealers are now growing it in their attic, a dusty and damp environment and even contamination with asbestos has been mentioned. What do you think? Is some of the marijuana on the streets contaminated?