The U.S. Code is a topical arrangement of all of the federal laws currently in force. All states also publish codified laws.
These opinions have the force of law.
e.g. the federal or state EPA. The administrative law of U.S. federal government is compiled in the Code of Federal Regulations (or the C.F.R.); for Ohio, it is the Ohio Administrative Code.
The text of bills and laws at every level are increasingly available free online from the governmental bodies that create them.
If that doesn't do it, there are lots of other places to go looking, which you will find attached to this guide.