There is no need to point someone out in a line-up to charge someone with robbery. There are many other kinds of evidence that could apply, such as forensic evidence (DNA, fingerprints, fabric samples, etc.), the testimony of witnesses, the testimony of others charged with the crime, security camera tapes, etc. Line ups are just one of many tools used in law enforcement. If you husband is arrested for armed robbery, *don't* try to figure out what to do yourself; get a criminal defense attorney. If you can't afford one, your husband has a right to have one appointed for him. In the meantime, he should not speak to the police, prosecutor, etc. until he talks with his lawyer. Good luck.