It may not be fair but it is legal. There is NO law on attendence policies; it is up to the employer's free choice or discretion. If you do not have a written employment contract protecting or guarantying your job, you are an "employee at will"; an employee at will may be terminated at any time, for any reason, includng even a single absence. There is thus no protection for you in regards to your attendence--your employer may do whatever it likes, and is NOT obligated to treat employees fairly or equally.