I dont think so. Poll on CNN today asked whether the police had over reacted in this case. 80% said they had not. Citizens are with Eunice and the police. As long as there is the threat, people of middle eastern descent are going to have to learn to be of reproach.
Unless CAIR can find evidence that Eunice is a member of the Klan or has left a paper trail of hate toward arabs as some do here, I dont see how the three students could win their case. Its a she said / he said. She reported what she had heard immediately after the incident. She had no reason to fabricate it. Her son told her they could be pulling her chain and she agreed and even mentioned this to the police. The government asks us to be alert and to report just this kind of thing. I cant imagine a jury that's going to find against Eunice if the case should go to court.