You can rely on a lawyer's advice all you want, but it won't get you out of trouble.

I'm always telling my client not to do stuff and, when they do it anyway, saying "I told you so". The courts don't let you off just because your lawyer gave you bad advice,except in criminal contexts, like the case where the court-appointed lawyer slept through his client's death-penalty trial.

If the lawyer gives truly skanky advice (see, for instance, Bush's White House counsel) she may be subject to professional sanctions or a juicy malpractice suit. She could also be investigated criminally, but you'd have to show an intent to tell the client to break the law, as opposed to mere incompetence (it's sometimes hard to tell with Alberto G.).