Aris Boch's forcefield trap
From The Stargate Omnipedia
A shield used by Aris Boch for the purpose of trapping bounties. Unlike the personal defense shields the Goa'uld equip themselves with, Boch's shield will not allow a slower-moving object (a thrown knife as opposed to a bullet) pass through. The shield is sensitive enough to stop any object from escaping at any speed.
In this respect, Boch's shield is far more similar to Tok'ra force shield technology. It may also allow objects to move inside the field, though this is unproven.
KEY EPISODE
Deadman Switch - Aris uses a forcefield trap to capture SG-1.