24 Hour Fitness gyms asks for a fingerprint/thumbprint on each visit. Is this not legal? It doesn't work well for me: I always must make multiple login attempt

24 Hour Fitness gyms asks for a fingerprint/thumbprint on each visit. Is this not legal? It doesn't work well for me: I always must make multiple login attempts and inevitably an employee must intervene and approve. I miss their previous system which used a simple bar code.