[Source] The riot shield was a personal energy shield used by law enforcement and planetary defense forces. Constructed with a metal frame, it generated an energy shield that was opaque to anyone who viewed it from the outside, thus inhibiting the opponent's view of the wielder. However, the inner side of the energy shield was transparent, allowing the wielder to have clear vision through the shield. Other versions were physical shields, such as the riot shields carried by the Coruscant Guard.