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I've almost completed Chapter 3 "Unforeseen Consequences" and haven't seen anything which looks like it could be related to this achievement. What do I need to do in order to unlock this achievement?

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up vote 4 down vote accepted

The Ethically Questionable achievement comprises of the following actions and occur during the 'Questionably Ethical' chapter;

  • Killing an alien grunt with poisonous gas
  • Using the tesla discharge on the bullsquid
  • Using poisonous gas on the headcrabs in their habitat
  • Shooting the headcrabs with a laser
  • Firing the snark cannon until it breaks

As mentioned by PWhite these are all segmented off in their own separate rooms where you're generally presented with a button to press to activate lasers.

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To me, these seem more like terminating questionable experiments rather than performing them. – SaintWacko Sep 18 '12 at 12:41

I am unsure about in BMS, but in the original Half-Life, some room contained what could be considered "questionable experiments." They occur later in the game, and take the form of rooms where there are (usually caged) aliens and a button. Pressing the button will kill the aliens. This may be what you are searching for.

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This is pure speculation. – deutschZuid Sep 18 '12 at 8:39

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