How pure is speed when bought on the street?

by the time it has gotten to the street it has basically every time, been cut with at least two different things. Cutting is mixing something with it so there is more of it. It is really dirty by then and it is a 10-15min rush anyway. way to expensive, not worth it.

-someone who's been there

Ya Mr been there, so have i and you didn't answer his question, street cocaine is anywhere from 20-40% pure on average, depending on where you live