In Dick's "Do Androids Dream of Electric Sheep?" we learn that androids can commit suicide by holding their breath:
"How'll you kill yourself without it?" Rick asked. "If you fail on the test?
"I'll hold my breath."
"Chrissake," Rick said. "It can't be done."
"There's no automatic cut-in of the vagus nerve," Phil Resch said, "in an android. As there is in a human. Weren't you taught that when they trained you? I got taught that years ago."
"But to die that way," Rick protested.
"There's no pain. What's the matter with it?"
Then, Rick Deckard obtains a weapon that can temporarily stun androids by stopping them breathing. It's said that while it also works against humans, they can stay conscious without breathing for a while, long enough to give them a distinct advantage.
So, why not to test androids this way instead of using the Voight-Kampff or other empathy tests? Or is that weapon is supposed to be a fake, gave to Rick only to make him fail his mission?