Do you think there would be many people calling for the resignation of a rogue cop who flagrantly violated the law but in the process managed to solve a much higher than average number of crimes?
Fortunately, the populace does not decide justice. Judges and lawyers are not elect, for this very reason.
But we shouldn't go too deep with the hypothetical questions. In most (western, civilized) parts of the world evidence is evidence. And they have lesser problems with police brutality, pretty much any way you look at the data (from bullets fired to people's conceptions).
A judge is supposed to be neutral, but a prosecutor isn't. This isn't an issue of brutality, we would need stats on the number of illegal searches conducted in different countries and we would need to know that these stats were accurate. This might be difficult because most illegal searches probably go unreported.
