Gardai have arrested 66 people so far over the rally weekend – but genuine rally fans aren’t among them.
Another 36 people were held overnight, on top of the 30 arrested in the previous 24 hours.
Almost all the arrests have taken place in and around Letterkenny.
Overnight 15 people were detained for dangerous driving. Six people were charged with drink-driving.
Inspector Michael Harrison said very few of those held had even been to see the race.
“They are here for the weekend but not to follow the rally in the same way as rally fans are,” he said.
“The rally stages are being held in the Milford District and almost all of the arrests have taken place in the Letterkenny District,” said Insp Harrison.
“Most of those held haven’t even been to see the rally. At the rally itself we have found the fans respectful. They are here to see the race and we’ve had no real issues there.
“The crowds at the rally are enormous this year; the largest I’ve ever seen.”
Letterkenny District Inspector Goretti Sheridan said 36 arrests took place overnight, adding to the 30 arrests on Friday.
“Overnight we have made 15 arrests for dangerous driving and six for suspected drink-driving,” said Insp Sheridan.
She said 39 arrests were for public order offences while there were 4 arrests relating to drugs offences.
Insp Sheridan said three gardaí injured when their patrol car was hit by another vehicle early yesterday morning have been released from hospital.
A boy aged 17 has been released from custody pending further enquiries.