If there is widespread abuse of Adderall, then take it off the market.
Whatever Lindsay Lohan is into, and it probably isn't good, it doesn't really matter what the opinion is of Adderall when her problems run deeper than a prescription drug. It's a matter of where she is at mentally and physically, and Adderall might actually be helping her with a real case of Attention Deficit Hyperactivity Disorder (ADHD).
The problem is, Adderall is not what anyone should be giving to children; it's an adult drug and Lohan is an adult. If her doctor has her on it, then who should be second guessing that diagnosis--a rehabilitation center or TMZ?