HOUSTON -- Imagine trying to see who your child is talking to on social media, but the pictures and messages are gone before you have a chance to look.

Police said mobile apps like Snapchat, Kik and Text Plus have them worried.

The bad guys use it too. Think about it this way, where s the bad guy that wants to approach children where are they going to go, said . They are going to go where the kids are. Well the kids are on Snapchat. Well that s where the predator is going to go.

Investigators said apps that automatically erase can make it very hard to track down people who prey on kids.

Police said parents should check their phones and know all they can about the apps kids are using.

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