BALDWIN, Long Island (WABC) -- A grandfather is suing the Nassau County Police Department claiming cops wrongfully arrested him and used excessive force when they threw him to the ground and handcuffed him.

Tyrone Phifer says police arrested him in a case of mistaken identity three years ago and then he says cops tried to cover it up.

He said that morning was the worst day of his life and now he wants justice.

After it took nearly a year to clear his name in the court system, Phifer has a filed a case of his own -- a $5 million federal lawsuit.

"This is not a joke, this is serious and this happens over and over and over again," said civil rights attorney Fred Brewington.

As you see nassau county ny police are not nice or good officers they are violent people.