  We present a theory of chemokinetic search agents that regulate directional
fluctuations according to distance from a target. A dynamic scattering effect
reduces the probability to penetrate regions with high fluctuations and thus
search success for agents that respond instantaneously to positional cues. In
contrast, agents with internal states that initially suppress chemokinesis can
exploit scattering to increase their probability to find the target. Using
matched asymptotics between the case of diffusive and ballistic search, we
obtain analytic results beyond Fox' colored noise approximation.
