Britta shrug
Yeah, I think that's it entirely. Sometimes he'll make wide leaps of logic based off of some really obscure piece of evidence. Even if they trust his judgement, they have to worry about the bureaucracy and they can't exactly petition for a search warrant based on Sherlock's hunches.

I think this show does a good job of balancing the 2 without making it just another show where the genius is doubted by the higher ups and he has to break the rules to prove them wrong.