Final answer:
Mack could be charged with brandishing a weapon or aggravated assault for threatening an officer with what appeared to be a deadly weapon, even though the handgun was unloaded.
Step-by-step explanation:
In the scenario provided where Mack draws an unloaded .38 caliber handgun on an officer and threatens to shoot, Mack could be guilty of a number of charges. However, based on the information that the handgun was not loaded, this could potentially rule out attempted murder as there was presumably no actual ability to complete the act.
Assault with a deadly weapon usually requires that the weapon is capable of producing significant bodily harm, which in this case, it was not, since it was unloaded. However, courts have found that if the victim perceives the weapon as loaded and capable of causing harm, it could still qualify.
Mack's actions could most straightforwardly fit the charge of aggravated assault, as he used what appeared to be a dangerous weapon to threaten the officer. Alternatively, the act of drawing and pointing the gun can constitute brandishing a weapon, depending on the jurisdiction's statutes regarding the unlawful display of firearms.