The cops get a warrant and go in to Joe's house looking for evidence of drug dealing.
There is a bottle of drain cleaner under Joe's bathroom sink. Near his computers they find a digital scale, a bottle of 99% ISA alcohol, a bottle of acetone, and a few glass bowls.
The drain cleaner is for getting hair out of the shower. The ISA and acetone and the Pyrex bowls are for cleaning and refilling print cartridges.
The lot of it is put into a box and paraded into court as Joe is charged with "intent to manufacture controlled substances".