According to this article (If information is outdated, please so state in the comments section):
...Officer James McLellan said Thursday [September 17, 2015] the family is free now to recover the clock that was seized as evidence, but the family has not kept appointments for meetings to do so.
Irving police and school officials have said they handled the situation properly in an abundance of caution.
Irving Independent School District Communications Director Lesley Weaver said there is more information, but it cannot be released without a privacy waiver from the family.
“All they have to do is sign a release form and we’ll be able to give a different perspective of what happened that day in the classroom and the hours following,” she said....