Strut Failure

Ok, I have 112,000 miles on my original struts, and they are working very well. No bounce back at all. Perfect shape as far as struts go. A friend of mine with a much lower mileage svx was told that his struts would need to pass PA state inspection. What gives? How could mine be fine and his be not only bad, but bad enough to not pass inspection? Has anyone here had to replace their struts? if so, at what mileage, and what is an indicator of bad struts.

-Mike