Only problem I see is that if the guy continues to spit, he would eventually spit his way out of the paper bag. It's not like it was plastic, or anything!
We have the spit hoods. They work quite well, and allow the spitter to see, which means it's less traumatizing. It's all about "trauma awareness" these days. The paper bag is better at maintaining the prisoner's anonymity for the perp walk, though.
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