Yanez trial begins at a time when charges against officers are rare

A banner lists people killed in Minnesota.
Denisha Young, 19, right, of Eagen, held one end of a banner listing the names of people killed by police in Minnesota since 1984. Protesters gathered for a Justice for Philando Castile rally outside the St. Anthony Police Department headquarters on July 10, four days after Castile was killed by St. Anthony police officer Jeronimo Yanez.