Poisonous Dart Shooters
This trap sends poisoned darts on a specific route (from one wall to another), and if Lara is hit by one, she is poisoned; her life meter will turn yellow and start to blink. If she doesn't use a medipack or, in the PC version, reach a Medi Crystal on time, her life meter will be drained and she will die.
Compared to the common dart shooters, they are hard to see. Instead of a noticeable blow pipe there's only a small cloud of smoke on the wall after shooting. Also the darts are - strictly speaking - only lines that are flying through the screen.