I've already got a nice scale and calibration weight. I know it works properly because every time i drop my 50g cal weight it reads 50.00. However, most of the time I'd have a buddy pick it up for me and bring it to my place, then I'd smoke him up for his trouble, eliminating any risk on my part. Unfortunately, I often end getting bud that came from somebody I've never me before. My friend will always tell me 'Dude weighed it out in front of me.' Yet it's consistently short. I'm convinced that those jokers don't even know how to use their damn scales properly.
Also, I was a college student until last Dec and barely had enough money to pay my rent each month, much less buy mass quantities of bud, although i realize it would have been much more economical in the long run. Problem is I didn't have enough to do that at the time. Now I'd rather not do that because I'm planning on moving as soon as I find a place to stay in Colorado (my lease where I'm currently at ends in 2 days)
How good of a friend? If "dude weighed it out right in front of" him, and it was good then...but not when you weigh it...who took it? My thought is..it's him pinching your sack. Dealers don't last to long if they're selling short bags or don't know how to use their scale. I guess your friend could just be clueless...but either way, go somewhere else....for 2 days.