A 26-year-old man from unincorporated Spring Grove was arrested Thursday after police found at least 70 grams of crack cocaine in his home, the Lake County Sheriff's Office said Friday. A long-term investigation by the Lake County Sheriff's Special Investigations Group determined that Derrius L. Crenshaw of the 38000 block of North Harold Place was dealing cocaine, according to a news release from the sheriff's office. Members of the Special Investigations Group and Lake County Sheriff's warrants team served a search warrant Thursday at Crenshaw's home.