The police have to have probable cause to make an arrest. That means there's at least some evidence. If he hasn't been indicted, he's entitled to a PR bond and you should talk to his attorney about that. If he has been indicted, that means a Grand Jury has also found probable cause in the case. If you're at this stage, unless he's willing to take the State's offer, he's going to have to set his case for trial. If you can't post the bond, he will be in custody until trial. If you're not happy with the court-appointed attorney, you're always free to retaib counsel. I believe I've covered the process.
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What Ms. Jaggers says about a person being held on the agg robbery without indictment and more than 90 days has passed being entitled to bond is generally correct. There is at least one important exception. There must be no other holds ont he person for which the required time in jail without indictment has not passed. The actual statute, Texas Code of Criminal Procedure Article 17.151, speaks in terms of the a amount of time the prosecutor has to get ready for trial. Without an indictment, the prosecutor simply is not ready.
Whether there is enough evidence can be challenged by an examining trial is there has not been an indictment (or an "information" if the defendant waives the right to have the grand jury look at the case.)
Otherwise, whether there is enough evidence is an issue taken up at the trial of the case.
By now, your boyfriend ought to have been appointed a lawyer if he has not hired one. The questions you ask here are ones he might want to ask his attorney.
Answers on Avvo are for general information purposes only and should not be relied upon as legal advice. No attorney / client relationship is created by providing this answer. For specific advice about your situation, you should consult a competent attorney of your choosing.