To get social security disability (SSDI) or supplemental security income (SSI) you must demonstrate you can't work. If you currently do work, they are likely to say "you are able to work, hence, no award." If you are laid off or fired, but only once, they'll reject you immediately unless you have a listed diagnosis that automatically qualifies you. One example would be schizophrenia, another would be quadriplegia.
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A finger in every pie.