More than 70 vehicles were stopped across Derbyshire as part of a nationwide crackdown on rogue traders.
The day of action was aimed at reducing doorstep crime.
Roving patrols were carried out throughout the county, with officers attending reports of suspicious activity.
A checkpoint was also set up to target vehicles as they passed through the area.
PC Chris Bond, from the intelligence unit at Derbyshire Police, said: “Rogue traders are people who try to con vulnerable people into paying for unnecessary or vastly overpriced work on their home.
“The aim of the operation was to target rogue traders and to remind them we are actively looking for them.”