The present article describes the use of plants as bioassays for the genotoxicity detection induced had leached of soils with arsenic (As) of three places of the half-deserted one in the states of Querétaro and Hidalgo, Mexico. The test of induction of micronúcleus was used in the cells mothers of pollen of Tradescantia clone 4430 (Trad-MNs). The results demonstrated that the micronúcleus frequency was bigger for those leached of the soils coming from the community of the Salitre, Hidalgo, and of the community of Bella Vista del Río, Qro. compared with the group control of those leached of near soils to the Municipality of Querétaro. In all cases there was a significant difference (Tukey p>0.05).