(Shafter, CA)  --  A registered sex offender from Oregon who allegedly led cops on a motorhome chase from Los Angeles to Bakersfield is now in custody.  NBC4 reports that Stephen Houk was nabbed yesterday afternoon in a train yard in the desert near the California-Nevada border.  He allegedly led the CHP on the 100-plus-mile pursuit Tuesday night that ended in an almond orchard in Shafter, near Bakersfield.  That's where he reportedly gave police the slip and hopped a train.