The biggest cost, you won't be surprised to hear, is personnel.
There were about 500 law enforcements officers at the Capitol Saturday--153 from Michigan State Police, 190 from Lansing.
Lansing also had 22 other staffers there: people to block off roads, manage communications, and IT personnel. The balance is equipment and supplies: the costs of food, video surveillance equipment, van rentals, and even the cost of gasoline.
The state has similar expenses and they are working on their estimate. Was it worth it? The police in charge say absolutely.
"If you look at past history, if you look at places where these types of precautions have not been taken, the cost has almost always exceeded what we would have spent in trying to prevent things from happening," says 1st Lt. Eric Johnson, MSP Lansing Post Commander.
Every agency involved will pay their own costs.
The mayor will present those figures to the city council Monday night. He says the diversity rally cost between $10,000 and $12,000, about half of which was paid for with private donations.
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