Calebinflorida While I don't believe Jesus was the messiah, of course, as a jew I can attest that the details of the crucifixion attributed to this case do suggest he was crucified with thieves.
How? By reading the new testiment like anyone else?
Almost every book I have ever read had been quite certain that IN GENERAL crucifixtion was reserved for crimes against the state, sidition basically.
Now, that's not to say that this general principal was not abused.
This piece was called a sidile, and likely rested under the bottom, for the purpose described.
Interestingly, another witness myth, that Jesus was crucified on a stake, has been laid to rest by archeologists who say that the victim would carry the crossbar or patibulum (weighing 50-100lbs)and that this would rest on the upright (in a t bar shape at the top.* described as a tau which is Latin equivelent shape T )