forcefield, Tok'ra
THE STARGATE OMNIPEDIA
FORCEFIELD, TOK'RA
Forcefield of Tok'ra design, capable of being configured to let in objects outside the field radius, but not out again. The forcefield is generally cubical in shape.

KEY EPISODE(S) -
Evolution, Part 1 - SG-1 learns that a super-soldier is not confined by the power of the Tok'ra forcefield.