At the Sandia National Laboratory in Albuquerque, New Mexico, project engineers have been working on a different type of restraint system: a foam so sticky it can literally stop a suspect in his tracks. The foam is delivered from a specially-developed dispenser that is carried in a shoulder sling. When fired, it ejects the sticky foam from the dispenser's cylinder.
Variety of problems have been found with Sticky Foam:
It can be lethal if sprayed toward the face, causing immediate suffocation. However the foam could be useful for denying access to certain rooms or corridors, as in the case of a drug raid or a prison riot. Currently there are no "antidote", while the foam is non-toxic, the solvents that unstuck a person are potentially toxic, and so far, no totally safe and effective solvent has been found. The other alternative is to cut the individual out of their clothing with a pair of scissors