Md. Code Ann., Com. Law § 12-505.2
A seller or holder may not enter into a closed end retail credit account agreement, providing for an initial rate of finance charge pursuant to § 12-505(a)(3) of this subtitle, which contains a provision that permits the seller or holder to increase or decrease the applicable rate of finance charge from time to time during the term of the account.
Added by Acts 1982, c. 753, § 1, eff. July 1, 1982.