“ The officer who answered the telephone and used artifice was engaged in a general, exploratory search to obtain evidence and leads incriminating anyone of any possible crime. Until the intercepted conversation, there was absolutely no lead connecting petitioner with any unlawful activity.
The permissible bounds of a search of the premises of an arrest have thus been extended. The import of such extension is dangerous. Police often lawfully enter a house to make an arrest. ”

“ The information given by Coates was confirmed when the officers saw petitioner. Thus, I assume that they had probable cause to arrest and search petitioner.
While we have sustained the validity of searches of the home of a person validly arrested (Agnello v. United States, 269 U.S. 20, 46 S.Ct. 4, 70 L.Ed. 145; Harris v. United States, 331 U.S. 145, 67 S.Ct. 1098, 91 L.Ed. 1399; United States v. Rabinowitz, 339 U.S. 56, 70 S.Ct. 430, 94 L.Ed. 653) we have stressed that the bounds of such searches are not unlimited. ”