a staff person lock a resident in his room because he doesn't want take his prescribed medicines. This prohibited technique is an example of abuse or chemical restraint

Abuse

Explanation:

Let is first define both of these terms.

Abuse is a cruel or unfair treatment of a person or an animal. It can be physical, emotional, verbal, psychological abuse etc.

Chemical restraint is use of medications in order to restrict someone's behavior or the freedom of movement.

In this particular exemple, we see that a staff person locked a patient for not wanting to take his medicines. Although, it's connected to medicines, from the explanations above, we can conclude that this is noy a case of chemical restraint, but a clear case of an abuse.