NUMISMATIST / PHILATELIST / LEPIDOPTERIST

collectors
  1. A numismatist collects coins.
  2. A philatelist collects stamps.
  3. A lepidopterist collects butterflies.

NOTE: The hint said, "You would not expect to get arrested for being any of these." While this is true, we have this warning from Shawn McManus:

Certain species of butterflies are protected as endangered species. Butterfly poaching carries severe fines and could result in jail time if a certain number are killed.

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