Distinct from detection — active measures to shake a surveillance team. Dry cleaning, the trap street, breaking the floating box, and using terrain and timing to your advantage.

Your surveillance detection class taught you how to tell if you're being followed. This class is what to do actively — the measures you take to shake a surveillance team once you've detected them, or to prevent them from ever getting a fix on you.
Detection is observation. Counter-surveillance is action.
'Dry cleaning' is the suite of maneuvers you run to confirm surveillance and shake it. The idea: you take actions that a normal person wouldn't take, and you watch to see who follows.
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Never use field techniques on private property without permission.
Never hide or transport anything dangerous, messy, or valuable.
Always operate within boundaries set by your parents or guardians.
Debrief your Handler after every mission — no exceptions.