Section 2472, Pub. L. 99–570, title IV, § 4225 , Oct. 27, 1986 , 100 Stat. 3207–148 , related to responsibilities of Indian Health Service for alcohol and substance abuse prevention and treatment. Section 2473, Pub. L. 99–570, title IV, § 4226 , Oct. 27, 1986 , 100 Stat. 3207–149 ; Pub. L. 100–690, title II, § 2217 , Nov. 18, 1988 , 102 Stat. 4222 , provided for program of alcohol and substance abuse prevention and treatment through Indian Health Service . Section 2474, Pub. L. 99–570, title IV, § 4227 , Oct. 27, 1986 , 100 Stat. 3207–149 ; Pub. L. 100–690, title II, § 2212 , Nov. 18, 1988 , 102 Stat. 4219 ; Pub. L. 101–630, title V, § 509(a) , Nov. 28, 1990 , 104 Stat. 4567 , provided for Indian Health Service program of alcohol and substance abuse detoxification and rehabilitation for Indian youth. Section 2475, Pub. L. 99–570, title IV, § 4228 , Oct. 27, 1986 , 100 Stat. 3207–150 ; Pub. L. 100–690, title II, § 2213 , Nov. 18, 1988 , 102 Stat. 4220 , provided for program of training and community education about alcohol and substance abuse. Section 2476, Pub. L. 99–570, title IV, § 4229 , Oct. 27, 1986 , 100 Stat. 3207–152 ; Pub. L. 100–690, title II, § 2214 , Nov. 18, 1988 , 102 Stat. 4220 , provided for establishment of Navajo alcohol rehabilitation demonstration program. Section 2477, Pub. L. 99–570, title IV, § 4230 , Oct. 27, 1986 , 100 Stat. 3207–152 , related to compilation of data and preparation of reports on cases of alcohol or substance abuse in which Indian Health Service personnel or services were involved. Section 2478, Pub. L. 99–570, title IV, § 4231 , as added Pub. L. 100–690, title II, § 2215 , Nov. 18, 1988 , 102 Stat. 4221 , authorized grants for alcohol and substance abuse prevention and treatment in urban centers.