Lasers can cause damage in biological tissues, both to the eye and to the skin, due to several mechanisms. Thermal damage, or burn, occurs when tissues are heated to the point where denaturation of proteins occurs. Another mechanism is photochemical damage, where light triggers chemical reactions in tissue.
March 9: Teams are allowed to begin negotiating with other teamsâ players who are set to become unrestricted free agents at the end of the league year. This is the first time the NFL is providing a window to negotiate with other teamsâ free agents prior to the start of free agency.
The 2015 NFL League Year began on Tuesday, March 10, 2015 at 4:00 p.m. ET. On Saturday, March 7, clubs started to contact and enter into contract negotiations with the certified agents of players who became unrestricted free agents upon the expiration of their 2014 contracts at 4:00 p.m. ET on March 10.