I've seen that exact show, and I recall that they came remarkably close to creating the necessary "seal" based on their experiments. It's one of the more entertaining episodes since, unlike most of what they take on, it appeared as though this particular urban legend is legitimate and/or reasonable certainly by comparison.
However, a website that I personally trust to debunk various urban legends and email forwards went to great lengths to research the particular story, which was found to be categorically false
. Who knows?!?
I plan on living forever. So far, so good...