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 NFL requires that a franchise player be paid at least the average of the top 5 players in the league at his position, or 120% of his previous year's salary, whichever is greater. The franchise player status lasts for only 1 year and can be renewed, but if not renewed the player is granted unrestricted free agency. In practice, many teams do not utilize the franchise tag; in 2008, only 12 of 32 NFL teams had a tagged franchise player. The tag, or the threat of using the tag, can be used as a negotiating tactic by the team to convince a player to sign a long-term deal with the same team.