30 years later the Hoffa tips keep coming. Weird ones.

The tips come in about once every week, sometimes from people who know things but mostly from those who are lonely, a little confused or up to no good.

After all these years--30 as of next week--the mystery surrounding the whereabouts of Jimmy Hoffa thrives, fed by a remarkably steady stream of tips. A second generation of investigators works from a shrinking pool of evidence as most of those who know what happened to the legendary labor leader die and those who think they know call the cops.