Can a teacher that has been required to wear a mask all year while teaching deduct the cost of the masks?

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Unfortunately, masks, face shields, and hand sanitizers don't qualify as tax deductions. 

However,  the cost of Personal Protective Equipment can be a tax-deductible medical expense for individuals — but only if they have a doctor's prescription and a specific health condition, such as a "severe chronic respiratory ailment" or "a severe chronic immune system disregulation."