About 30 laid off Michigan State Police troopers are back on the job. Several of these troopers are from posts in Northern Michigan. This trooper recall is thanks to federal money and grants. The MSP had laid off 100 troopers back in June. In November, over half were recalled. Today, about 30 more were recalled. The MSP says the recalls are based on seniority. These troopers are in training in Lansing this week. MSP says they'll be back to their posts by the end of the week.