There is a link on the MOI site, I cant remember what it is called but I will check it.

The problem with reporting to the police without photo evidence is who is to say this really happened or someone is just looking to get someone in hot water. Also, if the police are asked to keep an eye on a certain car (no license plate recognition systems here to scan random plates) you can forget it, it will never happen.

Like I said, take a picture, then perhaps they can take complaints seriously.

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"Diplomacy is the art of saying 'Nice doggie' until you can find a rock - Will Rogers"