I let my CFCE (Certified Forensic Computer Examiner) cert lapse about two years after retirement. At the time I was still teaching online and was a coach/teacher at the IACIS (International Association of Computer Investigative Specialists) conference near Orlando, FL every year. It was a bit of "payback" to an organization that helped me a great deal and resulted in my staying at my job for another four years after being eligible to retire. I stayed on because I was enjoying the work so much but finally retired because of other factors. But because of my staying longer my retirement bennies were much improved so the extra time was well worth it.