Bush wearing the wire again today?

I just saw Bush on CNN in a clip of his signing the Voting Rights (Extension) Act into law. When he turned around, I saw that now-familiar snaked wire on his back, under his suit. This time, the wire traverses his back from upper left to lower right.

Am I imagining it? Y'all check it out when the clip runs again. There is no box now, but I'm sure that they've learned their lesson and moved it to a less conspicuous place (like--> on his right side).

Who can find out definitively what that is? (Not that it truly matters at this point--I'm just deeply curious.)