Why is it when you fill out a FAFSA application do they ask if you were convicted of a drug offense?

There are many crimes that a person can commit such as robbery, forgery, murder, rape, theft, insurance fraud, just to mention a few. Why does it seem the only offense the federal government seems to be concerned with is being convicted of a “drug offense”? A drug offense can range from being caught with a marijuana joint to heading a large drug cartel. Why the emphasis on “drug offenses” over other crimes? The FAFSA application questions only ask if you were convicted of a drug offense, they do not mention any other criminal offenses? Why is this?