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STANFORD, CALIFORNIA 94305 e (415) 321-1200

STANFORD UNIVERSITY SCHOOL OF MEDICINE February 17, 1970

Department of Genetics

Dr. Harry W. Hays

Pesticides Regulation Division
Agricultural Research Service
U. S&S. Department of Agriculture
Washington, D. C. 20250

Dear Dr. Hays,

I am writing you at the instigation of a letter I just received
from Dr. Charles F. Wurster from the Environmental Defense Fund.

You will perhaps recognize me as being something less than
fanatic in my concern about the abuse of DDT. I would not advocate
the instant abolition of well established residual pesticides if I
felt that there were a realistic and effective program to control
their abuse and to reduce the level of environmental contamination
by them at a pace consistent with the spontaneous decay of existing
residues.

I am, therefore, quite alarmed at the allegations made by
Dr. Wurster that "policy is as it was before" and I would greatly
appreciate any. factual information that could enlighten me and help
to rebut this allegation or leave it standing as the case may be.

Sincerely yours,

a

Joshua Lederberg
Professor of Genetics

JL/rr
cc: Dr. Charles F. Wurster
Enclosure

LT. J. P. KENNEDY, JR. LABORATORIES FOR MOLECULAR MEDICINE, DEDICATED TO RESEARCH IN MENTAL RETARDATION

MOLECULAR BIOLOGY

HEREDITY NEUROBIOLOGY DEVELOPMENTAL MEDICINE

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