The man due to be questioned about the crash which claimed the life of one garda and badly injured another had been banned from driving for 15 years and should have been in prison.
Martin McDermott of Raphoe had 79 previous convictions and is expected to be questioned by gardai on his release from hospital
Garda Gary McLoughlin who was killed when his patrol car was stuck by another vehicle close to burt in the early hours of Sunday morning will be laid to rest in his native Leitrim later.
Donegal County Council will be represented by its Mayor Brenden Byrne who paid tribute to Garda McLoughlin:
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