Chapter 33. Interest and Usury. § 28–3301. Rate of interest expressed in contract. § 28–3302. Rate of interest not expressed and on judgments. § 28–3303. Usury defined. § 28–3304. Action to recover usury paid. § 28–3305. Unlawful interest credited on principal debt. § 28–3306. Parties compelled to testify. § 28–3307. Council of the District of Columbia authorized to exempt certain mortgages and loans. § 28–3308. Finance charge on direct installment loans. § 28–3309. Council of the District of Columbia authorized to exempt certain loans, and to change rates of interest. § 28–3310. Consumer protections. § 28–3311. Definition of interest. § 28–3312. Unlawful practices. § 28–3313. Penalties. § 28–3314. Right of action. § 28–3315. Exemption of institutions of higher learning from usury law.