In Terminator: The Sarah Connor Chronicles season 2 episode 17 "Ourselves Alone", at the end of the episode Cameron attaches an explosive to her head near to her chip, and she attaches the detonator switch to a locket and gives it to John Connor. Cameron puts that round John's neck.
After that they have the following conversation (as per Terminator Wiki):
John: I can't find her. (Referring to Riley)
Cameron: She's out there, she'll call you. Eventually, she always does.
John: Cameron, did you...?
Cameron: You know I didn't.
John: What have you been doing? You've been out here for hours.
Cameron: Making something...for you.
(Cameron hands John a pocket watch)
John: What is it?
Cameron: You tried to fix me. Twice now. It's not working.
Cameron: I'm not capable of self-termination.
Cameron: I can't kill myself, but you can.
John: Why would I want to kill you?
Cameron: You might have to some day. (John opens the watch to find a set of three buttons, one of them red) I've planted an explosive in my skull near my chip. It's a small amount, but it's enough.
(Cameron puts the watch around John's neck)
Cameron: All you have to do is hit the switch.
John: What would future John do now?
Cameron: Future John doesn't live here. You do.
After that, in the next episode "Today Is The Day, Part 1", when John questions Cameron about Riley's death, we can see John opening and closing the detonator switch locket and asking from Cameron "did you kill Riley?"
Finally in the middle of the episode "Today Is The Day, Part 2", John Connor finds out that Cameron didn't kill Riley, and he says to Cameron, "I'm sorry I doubted you".
So my question is: after episodes 17 & 18, did John Connor continue to wear the detonator locket switch around his neck all the time?