The parents of a 17-year-old boy who was shot by a San Antonio police officer in the parking lot of a McDonald's said the last three weeks have been a "horrific roller coaster" as their son continues to fight for his life.It was the first time Cantu's parents have publicly spoken about the Oct. 2 shooting, when Officer James Brennand opened fire on the teen.Therefore, those little steps we see daily, we just keep going back."Attorney Benjamin Crump, who is representing the family, said Brennand racially profiled Cantu and "thought he had the right to just eviscerate the Constitution."At the time of the shooting, Brennand had been on the force for seven months and was still on probation, a standard practice for San Antonio officers who graduated from the police academy less than a year ago."