A legal group is moving forward with a plan to challenge Minnesota’s policy to let only girls be on high school dance teams — after a Wisconsin boy was left out of his school conference dance meet. The Pacific Legal Foundation filed a complaint Tuesday with the U-S Department of Education’s Civil Rights division, claiming that the Minnesota State High School League’s policy violates the federal Title Nine law in classifying students by gender without what the group calls “adequate justification.” The foundation is representing Kaiden Johnson of Superior, a member of his high school dance squad who was left out of a conference meet in Duluth, Minnesota last December because the state only allows girls in that event. A foundation lawyer says it has given the state association one month to change its policy — and if it continues not to do so, the group says it has a lawsuit ready to file. The league has not officially commented.