Washington Metropolitan Area Transit Authority v. Hensley

How later courts describe this case

• "(D)oubtful questions, including factual ones like work-relatedness, must be resolved in favor of claimants."
• "[T]he fact that the injury would not have resulted but for the pre-existing disease, or might just have well been caused by a similar strain at home or at recreation, are both immaterial."
• aggravation of claimant’s underlying psoriasis was compensable injury within meaning of Act