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.
Now, if a player was waived by another team prior to March 1st, he can be signed (and play in the playoffs) up until the very last day of the season. Finally, NBA teams can sign certain players to their roster at any time between the start of the season (July 1st) and the last day of the regular season. 1  Provided a team has cap space and/or a roster spot, they can add a free agent at any point after the moratorium and the last day of the season.