Those herbal supplement pills. The ones that are plastic-like capsules with powder in them. Open them, empty out the contents, and stuff with tiny bits of weed. It's time consuming, but looks normal on x ray. Throw it in your luggage, and pray for the best.

If not, other methods that work are bra, crotch, inside of leg, taped in a hat (beanie), and if your really fat you can tuck it under your rolls