Well yes. It has been proven many times that a police officer has planted evidence on order to arrest an innocent person. The officer in many cases has been caught and charged and convicted himself. Do a google search on it.It's there
There have been many cases where, when the authorities have been under public pressure to make an arrest in a case going no where, have framed an innocent person just to please the press and the public. Most times it is an 'indian' or a hippy looking person or an ex con framed.( in the States it is normally a coloured person)You know the type? They make sure they take the worst looking mug shot of the person, then release the picture to the press.
And of course many of these people cannot afford a decent lawyer and are convicted.
Everyone is now happy, except of course the innocent person sitting in jail. Unless of course if he hasn't been executed.
Here's a good one for you sideshow
Notice the word "INTENTIONAL?"