SNIP

I found it strange that the FBI would have on record the fingerprints of
an Oregon lawyer, and that his prints were (mis)identified as being a
match for the ones found on the Madrid bomb evidence.

At the time I asked in a few forums how the FBI would have someone's
fingerprints - and was told that some US states require fingerprints
when you obtain driver's licenses.

If the lawyer ever served in the US military, his prints would be on
file, as are mine :-(

also prints may be required for such things as:
Lawyers bar exam and license
Concealed Weapon permit
various other occupational licenses & permits