Why don't we have police/state targeted surveillance software? A million data points about police activity on social networks (on their personal accounts) would

Why don't we have police/state targeted surveillance software? A million data points about police activity on social networks (on their personal accounts) would be a trove of enlightenment for the public. It's clear that they won't be transparent or share info about their personal or professional activities willingly... but we need the information regardless of their intransigence. Why should they be allowed to have privacy when they are so keen on abusing ours? I'm sure they feel the same way about us, but the honest truth is that going tit-for-tat against them re: surveillance works far better for the public as a whole.