The US dormant commerce clause doctrine allows for a true balancing test between legitimate state objectives and the burdens placed upon commerce.However, the doctrine relies strongly on ‘pre–screening’ facts to determine whether or not a law is discriminatory. The difference between a law that is de facto discriminatory and one which is ‘even handed’ but incidentally burdens commerce is a fine line, and it is not clear in the US practice that the courts have been able to give the doctrine a consistent effect over time.
Legal Issues of Economic Integration