How do you repress cocaine?

*This is from knowledge from my friend who did 6 years in prison* You will need acetone, and some how to press it, the easiest way is to put it in like 10 bags, add acetone, roll it in your hands, then add a little more but not much just to make it into a ball and not paste, put it in between 2 hard books or blocks then jump on it, then let it sit for about 4 hrs