Bankruptcy, UCC
Although the first claim on the funds transferred into the deposit account survived any secured interest against the acount, a subsequent commingling created a burden on the Trustee to establish that the funds remained identifiable.
http://www.ca5.uscourts.gov/opinions/pub/15/15-10274-CV0.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.