That has ALREADY been defined. 30 seconds on Google will get you this:
(d) For purposes of Subsection (a)(7), a person is incapable of exercising sound judgment with respect to the proper use and storage of a handgun if the person:
(1) has been diagnosed by a licensed physician as suffering from a psychiatric disorder or condition that causes or is likely to cause substantial impairment in judgment, mood, perception, impulse control, or intellectual ability;
(2) suffers from a psychiatric disorder or condition described by Subdivision (1) that:
(A) is in remission but is reasonably likely to redevelop at a future time; or
(B) requires continuous medical treatment to avoid redevelopment;
(3) has been diagnosed by a licensed physician, determined by a review board or similar authority, or declared by a court to be incompetent to manage the person's own affairs; or
(4) has entered in a criminal proceeding a plea of not guilty by reason of insanity.
(e) The following constitutes evidence that a person has a psychiatric disorder or condition described by Subsection (d)(1):
(1) involuntary psychiatric hospitalization;
(2) psychiatric hospitalization;
(3) inpatient or residential substance abuse treatment in the preceding five-year period;
(4) diagnosis in the preceding five-year period by a licensed physician that the person is dependent on alcohol, a controlled substance, or a similar substance; or
(5) diagnosis at any time by a licensed physician that the person suffers or has suffered from a psychiatric disorder or condition consisting of or relating to:
(A) schizophrenia or delusional disorder;
(B) bipolar disorder;
(C) chronic dementia, whether caused by illness, brain defect, or brain injury;
(D) dissociative identity disorder;
(E) intermittent explosive disorder; or
(F) antisocial personality disorder.
(f) Notwithstanding Subsection (d), a person who has previously been diagnosed as suffering from a psychiatric disorder or condition described by Subsection (d) or listed in Subsection (e) is not because of that disorder or condition incapable of exercising sound judgment with respect to the proper use and storage of a handgun if the person provides the department with a certificate from a licensed physician whose primary practice is in the field of psychiatry stating that the psychiatric disorder or condition is in remission and is not reasonably likely to develop at a future time.
(g) Notwithstanding Subsection (a)(2), a person who is at least 18 years of age but not yet 21 years of age is eligible for a license to carry a concealed handgun if the person:
(1) is a member or veteran of the United States armed forces, including a member or veteran of the reserves or national guard;
(2) was discharged under honorable conditions, if discharged from the United States armed forces, reserves, or national guard; and
(3) meets the other eligibility requirements of Subsection (a) except for the minimum age required by federal law to purchase a handgun.
(h) The issuance of a license to carry a concealed handgun to a person eligible under Subsection (g) does not affect the person's ability to purchase a handgun or ammunition under federal law.
Added by Acts 1997, 75th Leg., ch. 165, Sec. 10.01(a), eff. Sept. 1, 1997. Amended by Acts 1999, 76th Leg., ch. 62, Sec. 9.03(a), 9.04(a), eff. Sept. 1, 1999; Acts 2003, 78th Leg., ch. 255, Sec. 1, eff. Sept. 1, 2003.
Amended by:
Acts 2005, 79th Leg., Ch. 486, Sec. 1, eff. September 1, 2005.
Acts 2009, 81st Leg., R.S., Ch. 1146, Sec. 11.03, eff. September 1, 2009.