The investigation, code-named Operation Russell, allegedly raised questions about former commander Ray Adams's conduct before the Lawrence case, the Guardian said.
There was reportedly insufficient evidence to bring criminal charges and Adams told the newspaper this exonerates him and denied any wrongdoing.
More top news
Mostly dry tonight with some clear periods leading to chilly temperatures rurally.
PayPal, Amazon, AirBnB, Twitter and Spotify were among the sites hit by outages in a series of apparently coordinated DDoS attacks
The train was reportedly carrying 1,300 passengers instead of the usual 600 after a nearby road collapsed.