there is no traffic law in Qatar that mentions anything about radar detectors
Yes they are banned in Europe and North America
rm instead of getting a radar detector there is another instrument which is in use in USA and Canada. What it does is that it can change the road signal from red to green even when it is not the turn of that specific signal. it is normally installed in ambulances and firebrigade cars.
Try getting that instrument
for radar detector try getting a laser radar detector as the new radars are in qatar are laser based but the radar detectors can only warn you 100 metre before the radar or maximum 200 metres