Most facts, yes. Non-disclosure is the exception, not the rule, thanks to the Sixth Amendment's right to a fair trial. However, when national security is involved, the Classified Information Protection Act (CIPA) may apply, and some evidence may be reserved for in camera hearings.

Also, if the information would not exculpate the defendant, and the prosecution won't introduce it at trial as evidence of guilt, then the information can be withheld.

I'm on the verge of not trusting the US govt when they prosecute things. Epstein details being proclaimed and then hiding them is just the start. If the large and formerly mostly independent and trustworthy federal law enforcement groups can't disclose info there, what should make you feel like they are honest?