Question

which characteristic is a sign of drug addiction?
regular work attendance
easily able to stop taking a drug
experiencing legal problems
never taking more of a particular drug

Explanation:

Drug - addicted individuals often engage in behaviors that can lead to legal issues, such as illegal drug - related activities or actions due to impaired judgment. Regular work attendance is not a sign of addiction. Being easily able to stop taking a drug and never taking more of a particular drug are contrary to addiction symptoms.

Answer:

experiencing legal problems