1. Except as provided in subsection 2 , a person commits a serious misdemeanor if the person is intoxicated as provided under the conditions set out in section 321J.2, subsection 1 , paragraph “a” , “b” , or “c” , and the person does any of the following: a. Carries a dangerous weapon on or about the person. b. Carries a dangerous weapon within the person’s immediate access or reach while in a vehicle. 2. This section shall not apply to any of the following: a. A person who carries or possesses a dangerous weapon while in the person’s own dwelling, place of business, or on land owned or lawfully possessed by the person. b. The transitory possession or use of a dangerous weapon during an act of justified self-defense or justified defense of another, provided that the possession lasts no longer than is immediately necessary to resolve the emergency. 2010 Acts, ch 1178, §4, 19 ; 2017 Acts, ch 69, §8 ; 2017 Acts, ch 170, §47