Aggregating All Endangered Species Is Appropriate After setting its focus on the takes instead of commercial development, the Fifth Circuit next addressed whether Cave Species takes have a substantial impact on interstate commerce. The power to regulate commerce comprehends the control for that purpose, and to the extent necessary, of all the navigable waters of the United States. The unchallenged findings leave no doubt that the Arizona Train Limit Law imposes a serious burden on the interstate commerce conducted by appellant. Before: EDMONDSON, Chief Judge, DUBINA and HULL, Circuit Judges. This case exemplifies the role of States as laboratories. Could Congress delegate its regulatory power to the states? House, Representative Dingell, was explicit in this regard. Rolleston was a strong supporter of racial segregation. Do we assert regulatory. Cave Species as endangered.