‘In a recent appearance on All In with Chris Hayes on MSNBC, drug abuse and addiction expert Carl Hart of Columbia University made a shocking claim: There isn’t much difference between the demonized street drug methamphetamine (also known as meth or crystal meth) and the prescription drug Adderall.

It’s not the first time Hart has raised this idea. In a 2014 report, Hart and co-authors Joanne Csete and Don Habibi, also from Columbia, examined in depth the effects of meth on the brain, concluding that there is no discernible difference in the effects of any amphetamine, whether prescription or illicit.’

Read more: How Big Pharma gets away with selling crystal meth to children: By renaming it ‘Adderall’