Sentencing bump for possession of a weapon in support of the crime inappropriate where the weapon was locked in the trunk and the crime was use or possession of a user's amount of drugs.
http://media.ca8.uscourts.gov/opndir/18/08/171680P.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.