Disallowed From Using A Cane At Work

Background: my boyfriend has had back pain for years, and he uses a cane for this sometimes. He's been to the doctor for it many times, but all they've noted for it is mild scoliosis. Location is Ohio.
My boyfriend got a new job recently, working at the front of the store at a pharmacy chain. The job duties are what you would expect for that; register, stocking, helping customers, and I think some paperwork stuff on the computer? All tasks he can do while using a cane.
He's only recently started working there, but has evidently been told he can't use his cane while working on the floor. I'm disabled as well and know how the ADA protects me, but I'm not sure what information to give my boyfriend so that he can navigate this situation.
Advice?
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