The mobile prostate cancer screening unit is in downtown Boise today from 9 am to 5 pm offering free screenings to men. Any man age 50 or more should have annual checks and men age 45 or more with a history of cancer in their family should have annual screenings. There is no charge and to help raise funds for this service to continue the Main Street Mile fun run and walk will take place tonight at 6:25 pm. The event is open to anyone and you can call 386-9017.