The toxic pesticide found in Arkansas dairy products has entered the milk of some nursing mothers, a Little Rock newspaper reported, as health inspectors continued screening dairies where contaminated cattle feed may have been used. Tom Butler of the state Health Department said that 82 farms have been quarantined as sources of foods tainted with heptachlor, an insecticide banned as a carcinogen. He said that about 1,200 dairies remain to be inspected. Meanwhile, the Arkansas Democrat quoted a University of Kansas toxicologist as saying that levels of heptachlor up to the maximum allowed by federal consumer standards were found in the milk of women in the Eureka Springs area. State officials acknowledged the finding but did not recommend suspension of breast-feeding.