Many states have high bars when it comes to mental illness and guns.

[LeftInTX]

In Texas, you need to be determined "incompetent" by a judge, which is a high bar. You can also be denied a firearm for various felony convictions etc. You are more likely to be barred from owning a gun due to a criminal conviction, than mental illness. That's because mental illness needs to meet a legal threshold and not just a medical medical diagnosis. Although there are more people with mental illnesses than convicted felons, a doctor just can't call authorities on everyone that is being treated. Doctors are reluctant to take legal action against their patients.