Pretty much 99.99% of the stuff outside of dispensaries is laced with synthetic cannabinoids, amphetamines, opoids, ketamine...probably a mix of all of it on top of a stripped down bud.
All the THC is stripped and used for more expensive products like hash and the bud can be laced and sold at a higher price. Most of the herbs on the streets these days are stripped down and laced. They often dip the buds in a solvent mixed with the desired drugs and let them dry, causing crystals of the desired compounds to form inside the bud. Very very common.
99.99% of street marijuana is laced. You either have to grow it or get it from a dispensary to avoid toking up all sorts of pharmaceuticals.