Davis RL, Mostofi FK.

This paper describes the occurrence of six cases of testicular cancer occurring in police officers in contiguous counties in north-central USA between the years 1979 and 1991. The authors state that the only common exposure was the occupational practice of resting the radar gun on their lap in proximity to the testicles. The rate of testicular cancer was 6.9 times that expected.

As the authors point out a cluster of cases such as this is notoriously difficult to interpret. Cluster investigations are used mainly to formulate hypotheses.
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