If you were 18 and had sex with a 14 year old, whether or not you knew she was 14, I would imagine that CA had a criminal statute which made this conduct a crime. Moreover, there was probably no defense. Accordingly, whether or not there were any text messages, would probably be irrelevant. Consult with a local criminal attorney, but there is probably not much that can be done.
Before you pleaded guilty there was probably a series of questions which the judge asked you. Your plea was accepted based upon your answers. If you lied during that you have no one to blame but yourself. Among the reasons that was done was so after the fact the lawyer cannot be blamed as you are doing here.
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Unlikely, but have a local lawyer investigate. Avvo has a terrific "find a lawyer" tool to find a top-rated Avvo lawyer (10.0) with a low contingency fee (less than 30%) close to your home.
There's a lot of indicators in your question that leads me to suspect there's more to this case than you are letting on. Sounds like you were charged under the far more serious lewd and lascivious acts statute rather than the sex with a minor statute.
But anyway, if she told you she was 16, she's still underage and you knew she was underage and thus you were committing a crime. Plus how do you know the evidence you speak of wouldn't have been available at trial since you didn't go to trial but took a plea?
Very very doubtful, but if your lawyer is shown to have been ineffective you may have a chance. It is a very tough burden because you take a plea and you would have to show that you lawyer was actually more than incompetent, you would probably have to show that he intentionally hide information to make you plea. Unfortunately you have a very bad situation. Good luck, Tad
There is a lot missing from your question, but I assume you have been sentenced already, and that any time to appeal has passed. It is true that undoing a plea is difficult, but if your lawyer truly lied to you about evidence that would be a pretty good reason. However, there is a big difference between "no evidence of such produced by the state" and no such evidence existing. The state may have never bothered to "produce" such evidence because you chose to plead guilty. If you really think your lawyer lied to you, you need to contact an experienced writs and appeals attorney, and you should do so before you are off probation (which I assume you got because of the 288.1 report). Once you are off supervision, it's even harder to file a writ challenging the validity of your plea. That the girl was 5'10, full-figured and lied about her age is unlikely to matter.