Mandated productivity
What a delightful term. There is a large gulf between fabricated evidence and an individual officer's decision to exercise discretion. In my experience 'mandated productivity', in the UK known as 'Performance Indicators', meant arrests were made and discretion was not exercised.

Secondly, it was the specialist squads, invariably plain-clothed, that had a different approach, fabricating evidence was rare, although a feature in very high profile such as the 'Birmingham Six': http://en.wikipedia.org/wiki/Birmingham_Six. Not being professional in evidence gathering and ignoring current laws was far more frequent, such as the West Midlands Police Serious Crime Squad:http://www.innocent.org.uk/misc/wmidlands.html