Answer:
The MO Uniform Commercial Code, the statute that governs secured transactions generally, was substantially amended in 2001. This is a verbatim partial summary of the bill that amended that statute:
UNIFORM COMMERCIAL CODE - This act substantially revises Article 9 of the Uniform Commercial Code regulating secured transactions. The scope of Article 9 is expanded to include additional types of property in which a security interest can be taken by a creditor and additional kinds of collateral, including sales of payment intangibles and promissory notes, security interests created by governmental debtors, health insurance receivables, consignments, and commercial tort claims.
The site [see below] has the text of the bill which you can wade through, OR call your local legal aid office (or The Missouri Bar) and ask if they have a current brochure that explains repossessions.
Generally, when people speak of repossession (a legal action a creditor may take after a person defaults on a secured transaction), they speak of motor vehicle (or boat or trailer) repossession. If that is your concern, read your sales agreement carefully. It will tell you if you have given the seller the right to take your car, boat or trailer if you have defaulted on payment.