had  not     managed     to  produce     any     evidence    that    would   be
admissible  in  a   court   of  law.
As  White   strove  to  be  a   modern  evidence    man,    he  had to  learn
many     new     techniques,     but     the     most    useful  one     was     timeless:
coldly, methodically    separating  hearsay from    facts   that    he  could
prove.   He  didn’t  want    to  hang    a   man     simply  because     he  had
constructed  a   seductive   tale.   And     after   years   of  bumbling,
potentially crooked investigations  into    the Osage   murders,    White
needed  to  weed    out half    facts   and build   an  indubitable narrative
based   on  what    he  called  an  “unbroken   chain   of  evidence.”
White    preferred   to  investigate     his     cases   alone,  but     given   the
number  of  murders and leads   to  follow, he  realized    that    he  would
need    to  assemble    a   team.   Yet even    a   team    wouldn’t    overcome    one
of  the main    obstacles   that    had stymied previous    investigators:  the
refusal of  witnesses   to  cooperate   because of  prejudice,  corruption,
or, as  an  agent   put it, an  “almost universal   fear    of  being   ‘bumped
off.’ ” So  White   decided that    he  would   be  the public  face    of  the
investigation,  while   most    of  the agents  operated    undercover.
Hoover  promised    him,    “I’ll   assign  as  many    men as  you need.”
Recognizing the limits  of  his college boys,   Hoover  had kept    on  the
rolls   a   handful of  other   Cowboys,    including   White’s brother Doc.
These   agents  were    still   learning    scientific  sleuthing,  still   adjusting
to  completing  their   reports on  a   typewriter. But White   decided that
these   men were    the only    candidates  who could   handle  such    an
assignment:  infiltrating    wild    country,    dealing     with    outlawry,
shadowing   suspects,   going   days    without sleep,  maintaining cover
under   duress, and handling    deadly  weapons if  necessary.  White
began   putting together    a   squad   of  Cowboys,    but he  didn’t  include
Doc:    since   serving in  the Rangers,    he  and his brother had avoided
being   assigned    to  the same    cases,  in  order   to  protect their   family
