What is a legal presumption?
Can a legal presumption be rebutted by sufficient contrary evidence?
Wisconsin workers' compensation law contains many presumptions. For example, for firefighters, it is presumed that if a firefighter has cancer, the cancer is employment-related. The Statute applies to any State, County, or Municipal firefighter who has worked for ten years with at least two-thirds of the working hours as a firefighter who has cancer of the skin, breast, central nervous system, or lymphatic, digestive, hematological, urinary, skeletal, oral, or reproductive systems. For that firefighter whose disability or death is caused by cancer, the cancer diagnosis is presumptive evidence that the cancer was caused by employment. However, no presumption exists for firefighters who smoke cigarettes or use tobacco products for claims after January 2001. (Wis. Stat. §891.455 Presumption of Employment Connected Disease: Cancer)
Other presumptions in Wisconsin law include a presumption that a youthful worker (under age 27) is presumed to be able to earn the maximum wage rate by the time he reaches age 27, for purposes of Permanent Partial Disability, disfigurement, or death. For example, a McDonalds burger-flipper earning $10 per hour who has a severe burn is presumed (instead of the $200 or $300 he actually earns per week) to be earning $1,400 per week under the Youthful Age Presumption. Evidence of the worker's likely inability to earn the maximum wage (due to cognitive or academic deficiency or similar lower earning work history) can be used to rebut the presumption and therefore limit the maximum Permanent Partial Disability or disfigurement award.
In a recent cancer case, the Pennsylvania workers' compensation board found a firefighter cannot receive workers' compensation benefits for prostate cancer because he failed to show his cancer was work-related despite a statutory presumption for firefighters. The firefighter began working for the City of Philadelphia in the 1970s and retired in 2006 after a diagnosis of prostate cancer. He filed a workers' compensation claim saying his cancer stemmed from carcinogens he was exposed to while working as a firefighter, such as diesel fumes from fire trucks, second hand tobacco smoke from co-workers, and smoke from burning debris he encountered while fighting fires. Note he also acknowledged he smoked an average of a half pack of cigarettes daily since the 1960s. His doctor's testimony that his carcinogen exposure caused the prostate cancer was rebutted by the City's physician indicating that prostate cancer is typically more of a "disease of aging than it is of external influence." The Judge, in denying the claim, noted "Any elevated risks for prostate cancer among firefighters might also be explained by other factors, such as detection bias, ethnicity and geography."
The cancer presumption in Wisconsin (for non-smoking firefighters) would be more difficult to rebut, but factors such as family history may prove the "other evidence" necessary to rebut the presumption.