Well, first off, here is this:
TCA 39-17-1309. Carrying weapons on school property. —
(a) As used in this section, “weapon of like kind†includes razors and razor blades, except those used solely for personal shaving, and any sharp pointed or edged instrument, except unaltered nail files and clips and tools used solely for preparation of food, instruction and maintenance.
(b) (1) It is an offense for any person to possess or carry, whether openly or concealed,
with the intent to go armed, any firearm, explosive, explosive weapon, bowie knife, hawk bill knife, ice pick, dagger, slingshot, leaded cane, switchblade knife, blackjack, knuckles or any other weapon of like kind, not used solely for instructional or school-sanctioned ceremonial purposes, in any public or private school building or bus, on any public or private school campus, grounds, recreation area, athletic field or any other property owned, used or operated by any board of education, school, college or university board of trustees, regents or directors for the administration of any public or private educational institution.
(2) A violation of this subsection (b) is a Class E felony.
(c) (1) It is an offense for any person to possess or carry, whether openly or concealed, any firearm, not used solely for instructional or school-sanctioned ceremonial purposes, in any public or private school building or bus, on any public or private school campus, grounds, recreation area, athletic field or any other property owned, used or operated by any board of education, school, college or university board of trustees, regents or directors for the administration of any public or private educational institution.
It is not an offense under this subsection (c) for a nonstudent adult to possess a firearm, if the firearm is contained within a private vehicle operated by the adult and is not handled by the adult, or by any other person acting with the expressed or implied consent of the adult, while the vehicle is on school property.
(2) A violation of this subsection (c) is a Class B misdemeanor.
Then, there is this:
TCA 39-17-1310. Affirmative defense to carrying weapons on school property. —
It is an affirmative defense to prosecution under § 39-17-1309(a)-(d) that the person's behavior was in strict compliance with the requirements of one (1) of the following classifications: (1) A person hunting during the lawful hunting season on lands owned by any public or private educational institution and designated as open to hunting by the administrator of the educational institution;
(2) A person possessing unloaded hunting weapons while transversing the grounds of any public or private educational institution for the purpose of gaining access to public or private lands open to hunting with the intent to hunt on the public or private lands unless the lands of the educational institution are posted prohibiting entry;
(3) A person possessing guns or knives when conducting or attending “gun and knife shows†and the program has been approved by the administrator of the educational institution; or
(4) A person entering the property for the sole purpose of delivering or picking up passengers and who does not remove, utilize or allow to be removed or utilized any weapon from the vehicle.
IANAL, but here is my take:
1). If you conform with national "peaceable journey" provisions (i.e., lock the firearm in one locked container inside the vehicle and the ammunition in another, separate container), you
probably do not violate TCA 39-17-1309 (b) (1).
Please note, if my interpretation is incorrect, it's a Class E felony. The real question is "What does
intent to go armed mean?" Perhaps an attorney can tell us where it is defined in case law in Tennessee. I fear the judge will determine its meaning at the time.
2). If you comply with TCA 39-17-1309 (b) (1), you certainly comply with section (c) (1). If you leave it loaded, you are still okay with section (c) (1), but again, you are more likely to be violating (b) (1).
3.) TCA 39-17-1310 [b](4) does an employee no good, because an employee is
not entering school grounds for the
sole purpose of delivering or picking up passengers.
4). Regardless of the law, until we have a "parking-lot law" similar to those that other states have passed which apply to governmental entities as well as private employers, the local board of education will fire the employee for violating board policy if the firearm is ever discovered.
These opinions are worth what you paid for them.
ETA: In addition to being fired, a school board might choose to go to the next step, which would be to seek to have the employee's teaching credential (if such exists) revoked on the grounds of insubordination (since a firearm is involved, a board might choose to see it as egregious misconduct). I don't know that the board would succeed, but then again....