William O. Douglas,
Colonnade Catering Corp. v. United States…
“ The government agents needed neither a warrant nor these statutes to secure entry to this place of business since it was as open as any business establishment that seeks to sell goods and services to the public. The agents need to rely on the statutes only to carry out their duty to inspect after accomplishing entry. This was recognized implicitly by Congress in limiting the inspection to 'business hours' and daytime. Congress went beyond mere entry ”
