Cop nailed him with intoxicated possession (0.05 BAC) and improper storage. Oops.
It's interesting that the cop nailed him with both. Here are the relevant statutes:
269.10H: Whoever, having in effect a license to carry firearms issued under section 131 or 131F of chapter 140, carries on his person, or has under his control in a vehicle, a loaded firearm, as defined in section 121 of said chapter 140, while under the influence of intoxicating liquor or marijuana, narcotic drugs, depressants or stimulant substances, all as defined in section 1 of chapter 94C, or the vapors of glue shall be punished by a fine of not more than $5,000 or by imprisonment in the house of correction for not more than two and one-half years, or by both such fine and imprisonment.
140.131L(a): It shall be unlawful to store or keep any firearm, rifle or shotgun including, but not limited to, large capacity weapons, or machine gun in any place unless such weapon is secured in a locked container or equipped with a tamper-resistant mechanical lock or other safety device, properly engaged so as to render such weapon inoperable by any person other than the owner or other lawfully authorized user. For purposes of this section, such weapon shall not be deemed stored or kept if carried by or under the control of the owner or other lawfully authorized user.
140.131C(a): No person carrying a loaded firearm under a Class A license issued under section 131 or 131F shall carry the same in a vehicle unless such firearm while carried therein is under the direct control of such person. Whoever violates the provisions of this subsection shall be punished by a fine of $500.
Let's try some logic (Yeah, I know, logic and Massachusetts law don't go together):
If he broke 269.10H (what you refer to as "intoxicated possession," although it's actually
carrying under the influence), then he had the the gun on his person or under his control in the vehicle. There are two consequences of that:
1. If the gun was under his control, then it is not "deemed stored and kept," according to 140.131L(a), so he cannot be guilty of improper storage.
2. If the gun was under his control, then he's doing what 130.131C(a) requires of him, so he cannot be guilty of improper transport either.
Now let's try it the other way.
If he is not guilty of carrying under the influence (10H), then it's mean that a loaded gun in the trunk is not considered to be under his control. Then, (according to
Reyes) it's up to a jury to decide if the trunk is not good enough for the gun to be "secured in a locked container," or whether he is guilty of improper storage (131L). The government could also argue that because the car was moving, 131C comes into play, and he is guilty of breaking 131C because a loaded handgun is required to be under his control.