A dispute over marijuana may have led to a recent knife attack in Janesville.  17-year-old Teagen R. Tislau of Sharon is charged with Second-degree Recklessly Endangering Safety with Use of a Dangerous Weapon after an 18-year-old was cut across the nose in a Saturday night incident on Milton Avenue in Janesville.  The criminal complaint indicates Tislau told police he waited for the victim to get back to his car at the Kwik Trip before ultimately cutting him.  The complaint adds how the 18-year-old victim told police he had not seen Tislau in about four-months, since he’d stolen marijuana from him.  A preliminary hearing for Tislau is set for March 29th.