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Endrin Cacaj, a 25-year-old ethnic Albanian tech worker, echoed that view over coffee in a bar near the offices of the K.L.A.

At least one state health department has warned that careless use of endrin is endangering human lives.

The third of the naphthalenes, endrin, is perhaps the most toxic of all the chlorinated hydrocarbons now in use.

In the decade of its use, endrin has killed enormous numbers of fish, has fatally poisoned cattle that have wandered into sprayed orchards, and has poisoned wells.

There were cockroaches in the house they moved into, and after a few days they used a spray containing endrin.