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Amazon Prime has the original one first season streaming. They also have the one with the other host.

It currently airs on Escape, but it's only the re-edited ones (i.e. the Dennis Farina episodes). Check to see if Escape is available in your area.

It did air on the
Lifetime
network recently, though I don't see it currently scheduledIn any case, it was the re-edited, Dennis Farina hosted episodes that were airing in syndication(don't know why Robert Stack was removed
) so be aware.
Selected segments were released on DVD about 12 years ago, seven sets in all, but they are all out-of-print, though can be still bought used on Amazon for instance, though prices may be steep.