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The use of sting-ball grenades was inherently indiscriminate, the suit says, because the weapons exploded with hard rubber shrapnel firing in every direction.

On June 27, United lost defender Brooks Lennon for six to eight weeks with a knee injury he sustained when he slipped on a hard rubber surface on the edge of Toronto’s playing field.

Dr. Ashworth secures a mouth prop over me, a hard rubber tool that disables me from closing my mouth.

"Either soft rubber or hard rubber, and/or plastic, and they're used when you don't need a real gun. In other words, it's not going to be firing blanks," he said.

Salmomée Souag, 23, of Portland, Ore., shared a picture showing a hard rubber pellet she found in the street that appeared to be a riot-control device known as a baton round.