Fear not. Before being thawed out the prisoner was thoroughly searched. "But why" you may ask "was this not depicted in the strip?" I'll answer your question with another question. "Why" I answer "have I not bothered to indicate when our heroes eat, sleep, or defecate?"
Because it's boring. But when it's important to the story, I'll indicate it. Or sometimes I'll indicate it when it's funny. Which reminds me... poop is almost ALWAYS funny. I should be scripting more of that.