The validity of Kohler's rule has been investigated in Ba _(1-x)K_xFe_2As_2 single crystals for x=0.0 and x～0.02 grown by the self flux growth method using excess FeAs as flux. A sharp peak observed in specific heat measurement around ～136 K has been attributed to a structural transition accompanying the spin density wave (SDW) transition. An additional slope change in the resistivity profile at 0 and 6 T is observed around 70 K in the K containing sample. Measurement of magnetoresistance as a function of magnetic field (B) up to 9 T indicates that Kohler's rule is obeyed only below 50 K for x～0.02 but it is not obeyed for x=0.0. Based on Hall effect measurements the observed difference between the pristine and K doped samples is rationalized.
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