Discrimination?

So hubby was finally called for a job interview after 4 years of applying for a comcast position. The interview went great but they mention that his height might be a safety issue. He is 5 feet 1 inch. So as excited as we were of finally him getting a job he might not get hired because of his height. How upsetting. Is this considered discrimination?

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07/17/15
Its not in the job description.
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