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Recently, DFT calculations on EuCd₂As₂ in a FM ordered state with Eu moments alligned along the c-axis revealed a single pair of Weyl points. However, previous experimental studies on EuCd₂As₂ show that the magnetism is an A-type AFM with T_N ~ 9.5 K. Here, by discovering and taking advantage of EuCd₂As₂ chemical tunability, we report successful growths of single crystals of EuCd₂As₂ with two different magnetic ground states: FM-EuCd₂As₂ and AFM-EuCd₂As₂. Angle resolved photoemission spectrocopy shows an anomalous suppression of scattering in ferromagnetic Weyl semimetal candidate EuCd₂As₂. Unexpectedly, scattering rate is suppressed only in one of the bands over limited energy range that is controlled by presence of another, completely filled band. Such selectivity is highly unusual and can have potential impact on spin transport.