Policemen wearing pastel pajamas? Come on. Or ever see a real cop driving a ritzy sports car? Get serious. All the other TV cops are sissies. Sledgehammer premieres 730 Tuesday and then at 8 o'clock meet Harry Hooperman. Harry, dogs are not reliable informants. He's a cop with some very offbeat ideas. How's your plumbing? I'm not referencing your internal organs. John Ritter is Hooperman premiering 8 o'clock Tuesday on TVO.