At least every six months, the Commissioner shall ascertain those liable persons whose payments to the State are in arrears, the amount of the arrearage, and the amount of income or resources, excluding an estate of less than $1,500.00, from which any amount owed the State for care and treatment, as determined under section 8101 of this title, can be collected. (Added 1967, No. 305 (Adj. Sess.), § 1, eff. Oct. 1, 1968; amended 1973, No. 244 (Adj. Sess.), § 5.)