"Yes, I have cracked a few seemingly unsolvable cases during my career as a detective. The most recent case was a missing woman. She was married and had asked her husband for a divorce. The next day, her adult children reported her missing from her home. Her husband had a solid alibi, and we could not initially find any clues to help us solve this mystery. I decided to go over the contents that were taken from the home during a search warrant and review the photos of the residence. I noticed an odd-looking pen on the nightstand and found it in the evidence bag. When I looked closer at the pen, I discovered it was a spy pen. The pen was dead, but I sent it to our forensics crime lab, and they were able to analyze the audio. The victim had recorded herself while confronting her husband about a possible affair, but it had also recorded a conversation she had with someone she was seeing outside the marriage. It took six months to determine who the person was, but he shed a lot of light on the victim's marriage, which led us in a new direction, and we ultimately solved the case. Once we had irrefutable evidence, the husband confessed to playing a part in his wife's disappearance."