Question

which statement about stimulants is not true?
they may improve performance
they are always illegal
they may be prescription medications
some were banned by the fda and us military

Explanation:

Stimulants can be prescription medications (e.g., ADHD medications like Adderall), so they are not always illegal. Some stimulants were banned by the FDA and US military (e.g., certain amphetamines in some contexts). Also, stimulants can improve performance in some cases (e.g., increased focus).

Answer:

They are always illegal