What is meant by "taking the fifth?"

A common expression used when someone invokes his or her Fifth Amendment right that protects from self-incrimination, pleading the fifth prevents you from being forced to testify against yourself during a criminal trial.

counter-terrorism incorporates the practice, military tactics, techniques, and strategy that government, military, law enforcement, business, and intelligence agencies use to combat or prevent terrorism.

basically prevent, pursue, protect, and prepare, google it if you need more info

answer:

"it is often classified as either a schedule ii or schedule iii substance, making it illegal to possess for personal use or distribution. crystal meth can be ingested, injected, or smoked. it is a highly addictive substance and can lead to many different personal, medical, and legal problems."

this is the link

hope your friend dont get in trouble