SINGAPORE-An investigation officer with the Housing Board who was supposed to catch law breakers through surprise inspections tipped off his friend about such checks, helping the latter evade getting caught. Kalayarasan Karuppaya, 55, who held the rank of higher estate executive with the HDB's operations department, was on Monday( Aug 30) jailed for 25 days.He pleaded guilty to two charges under the Official Secrets Act( OSA), with a third charge taken into consideration. Kalayarasan was an HDB