life sentence for trading amphetamine pills

Three persons were sentenced for possessing and trying to trade amphetamine pills in Doha .One of them got life sentence the others 15 and 10 years .They possessed more than 201,000 amphetamine pills .
Their nationality was not mentioned but we can guess that they were expats as the court talks about their deportations after the prison terms ...Yet, there is one thing I do not understand ... how can someone be deported when he got life sentence ?
What life does sentence mean in Qatar ?

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