BOSTON (AP) _ Another previously hidden perk for Massachusetts State Police troopers has been revealed.

The Boston Globe reports that state officials last week released information about more than $3.4 million in additional payouts over four years, most of which went to the unit that patrols Logan International Airport, in the form of $40-per-day payouts for troopers who drive personal vehicles to work.

Some troopers earned up to $13,000 each year in per diems, adding to salaries that included five- and six-figure overtime payouts.

Records show about 100 troopers received per diem payouts each year between 2014 and 2017. The average annual payout was about $8,000.

The department has been embroiled in several pay scandals recently.

The Massachusetts Port Authority, which manages the airport, pays the troopers but does not manage them.

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