I don't believe Snapchat will be found guilty in a court of law for this feature, but I do believe it will create pressure for them to turn off this filter.

As brands are still starting to get invested in Snapchat, stories like these do not help bigger brands get over the hurdle to invest.  

A speed filter for teenagers seems like something that could be as easily abused as a Blood Alcohol filter where teenagers could see how drunk they got, competing for the highest BAC.  Though that might not be the intention, it isn't surprising to hear of stories like these.