Partial Source: The Wrestling Observer Newsletter
As noted earlier, WWE Diva Tamina Snuka suffered a concussion during a match on 6/3 taped for Superstars. The concussion took place during a match with Natalya when she took a bad clothesline. WWE has kept her out of the ring since then.
According to sources, the current protocol within WWE is that if a wrestler shows indications of a concussion or is diagnosed with one, they are immediately pulled from the ring. They are also prevented from returning until they can pass Impact testing and then must be cleared by a doctor.