. >> it can be stig mattizing. you are viewed as a criminal because of how you are and the way you look >> a terror alert ahead of the sochi olympics. airlines on the look out for toothpaste - a possible bomb-making ingredient. >> there is more to it. we return to a story about a haitian teacher and an extraordinary generous gift from an "america tonight" viewer. >> good evening, i'm joie chen. many american cities face the same challenge - finding and stopping the biggest threats to innocent citizens, especially the ones that may be hiding among them. many police departments around the country look to the controversial, but until now codified in policy tactic used by new york city pd called stop and frisk. it was a tactic aimed at making the streets safer, but unfairly they've abusively targeted people of colour. the practice hit home close to home for the brand new mayor, who promised to take action. our indepth look at crime and punishment. sara hoy finds he's taken the first stop to doing that. >> when i come o

. >> it can be stig mattizing.ou are viewed as a criminal because of how you are and the way you look >> a terror alert ahead of the sochi olympics. airlines on the look out for toothpaste - a possible bo

. >> it can be stig mattizing. are viewed as a criminal because of how you are and the way you look >> a terror alert ahead of the sochi olympics. airlines on the look out for