No. Provided there was a phone call, they had to investigate. Child abuse is an exemption to almost every legal principle you know, in the state of Texas. Almost all privileges are suspended etc.
Making a false report of child abuse carries an additional penalty here in Texas because it is indeed fast-tracked. If you have to make a false allegation, make it about anything else and your penalty will be halved.
EVERY report must by law be followed up on, even ones made anonymously or via hearsay. Hearsay testimony is allowed in child abuse cases in Texas courts btw, yet another exemption. See 261.301 and 261.304. of the Texas family code for more details.