This is already the case. Wiretapping orders in Europe can come from a large number of organisations, including any police force, interpol, a few UN departments, some branches of the EU itself, ... there is no judicial review. The wiretap orders do not mention a court case, there is no way to appeal them, and telling anyone about any order, even in general terms, is punishable by jail time (for the person who does it, not the person responsible for them. In other words, technically if you're an engineer at a telco and you tell your boss why you're spending hours without telling anyone anything, technically that's 2 years). There's no appeal, no information about a court case linked (because there may not even be a linked court case, e.g. when a kid I knew ran away I know the police tapped her phone to find her. There never was anything more than an investigation). And of course, the government is under no obligation to even pay for the time spent doing the wiretap, nor does it pay for the equipment and upgrades needed to make them happen (for instance cisco's "lawful intercept" licences, which run in the thousands of euros per device, alcatell, lucent, etc. have similar stuff).

The one positive is that it's a huge mess, and many police departments have no idea how to use these laws. But I find it hard to believe that there aren't a few police departments that are actually capable and using these rules for personal gain.