In the case of Pittsburgh Melting Company v. Totten, Inspector of the Bureau of Animal Industry of the Department of Agriculture in 1918, Pittsburgh Melting Company (PMC) challenged a federal regulation that required them to have their products inspected by government officials before they could be sold. PMC argued that this requirement was an unconstitutional violation of their rights under the Fifth Amendment's Due Process Clause because it interfered with their ability to conduct business freely and without unnecessary governmental intrusion. However, The Supreme Court ruled against PMC stating that such inspections were within Congress' power to regulate interstate commerce and did not violate any constitutional rights. The court held that these regulations served a valid public health purpose and thus were justified under the Commerce Clause as reasonable measures for ensuring food safety across state lines.

The dissenting opinion in the case of Pittsburgh Melting Company v. Totten, Inspector of the Bureau of Animal Industry of the Department Agriculture, 1918 was not explicitly stated in available legal documents or resources. Therefore, it is impossible to provide a summary for this specific request. The Supreme Court's decisions and opinions are typically well-documented; however, there may be instances where certain details such as individual justice's dissenting opinions might not be readily accessible or recorded.