Draper v. United States:   
United States Supreme Court, 1959. 

Facts:

      Known informant gave information that Draper would be carrying heroin.  Informant particularly detailed Draper’s physical appearance, the clothes, tan bag he would carry, that he would be getting off a train Sept. 8 or 9, and that he would be walking fast.

      The Cops arrested him, with him having the most clear information, and found the Heroin.

Reasoning:

• Hearsay can be the basis of a finding of probable cause.
• The test is that:
  • The information came from a past reliable informant, and
  • The excellent accuracy of everything gave “reasonable grounds” that the drug claim would be true also.
• The Court found that there was probable cause.