Hawaii has a strange history with prostitution investigations. [...] a year ago, police officers were legally allowed to have sex with prostitutes as part of investigations. The letter went on to say that many officers feel uncomfortable enforcing prostitution laws, but have jobs to do. Because many prostitutes know that the police need a verbal agreement of sex for money before an arrest is made, they will routinely do a 'cop check.' "HPD has met with judges, social service providers, and human trafficking experts to address this important issue," the statement said. [...] far the discussion has not yielded or produced a viable police strategy that does not involve the enforcement of prostitution laws.