A chief constable said his officers should not have attended the home of a blogger who tweeted "fact checks" about UKIP.
Green Party member Michael Abberton claimed officers advised him to delete the tweet, which the police deny.
Cambridgeshire's chief constable Simon Parr said: "In this instance police attendance was not required."
UKIP said it contacted the police because it believed the tweet breached Electoral Commission rules.
As a result two officers visited Mr Abberton.
Mr Parr said: "I believe in this instance police attendance was not required and I have asked for our approach to this sort of incident to be reviewed to ensure we do not get involved unless there is clear evidence that an offence may have been committed."
Officers said no further action would be taken against the blogger.
UKIP national nominating officer Pete Reeve confirmed he had contacted the police and the Electoral Commission about the tweet.