Scientist Victor Bierman, an expert witness for Oklahoma poultry companies, testified in federal court Thursday that a study by the state showing phosphorous pollution in a sensitive watershed was incomplete, rife with errors and "not scientifically defensible." The testimony targeted Oklahoma's closely watched case against 11 Arkansas poultry companies in a trial that began in September.
Bierman's testimony focused on a report by state expert Bernard Engel, a Purdue University professor who tried to estimate the tons of poultry manure dumped in the Illinois River watershed each year and its effect on the environment.
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