Police breath-tested the Duke of Edinburgh - and the driver of another vehicle - following a crash near the Sandringham Estate this afternoon.
A statement from Norfolk Police confirmed both drivers provided negative readings.
A spokesman said it was "force policy" to breath test drivers involved in collisions.
The crash - involving Prince Philip's Landrover and a Kia - took place on the A149 at Babingley, near Sandringham, just before 3pm on Thursday 17 January.
The Duke was uninjured. The female driver of the Kia suffered cuts while a female passenger had an arm injury. Both were treated at the Queen Elizabeth Hospital in King's Lynn and have since been discharged.
Emma Fairweather, the passenger injured in a car crash with Prince Phillip says the Duke should be prosecuted if found to be at fault.
The Queen has been to a Sunday morning service in Wolferton near Sandringham, but the Duke of Edinburgh was not with her.
The Duke of Edinburgh’s car crash at the age of 97 has prompted debate around the safe age of drivers.