John Duffy
...that psychological offender profiling was used by British police for the first time in capturing John Duffy, the so-called Railway Killer?
...that psychological <a href="./Offender_profiling" id="mwArA" rel="mw:WikiLink" title="Offender profiling">offender profiling</a> was used by British <a href="./Police" id="mwArE" rel="mw:WikiLink" title="Police">police</a> for the first time in capturing <b id="mwArI"><a href="./John_Duffy_and_David_Mulcahy" id="mwArM" rel="mw:WikiLink" title="John Duffy and David Mulcahy">John Duffy</a></b>, the so-called <i id="mwArQ">Railway Killer</i>?