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The inquiry is the title. Please let me know if this should be posted elsewhere.

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    Why do you want to know? Are you concerned about your health, the health of your pet spider, the planet, or simply your room-mate's trustworthiness? – Kate Gregory Jun 18 '15 at 12:01
  • Can't you just ask him or her!? – THelper Jun 19 '15 at 8:45
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If you have a particular location in the room where you suspect they may have been used, you could try releasing some live bugs there (ones that are moderately welcome indoors), eg some jumpy spiders. If they quickly die, that would indicate insecticide use.

Obviously you would ensure any bugs released are in good health to start with, and release several to get a more reliable result.

  • Sacrifice some bugs, to know if your roommate is a bug-killer lol – Sempie Jun 29 '15 at 11:42

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