The United States Supreme Court\u27s evidentiary ruling during 1971-72 manifested a hardening attitude toward criminal defendants. For example, police stop-and-frisk authority was broadened (and with it the use of evidence obtained therefrom); the scope of the immunity from criminal prosecution required to be granted by a governmental body before self-incriminatory statements can be compelled from a witness was narrowed; the right to have counsel at line-ups was limited to post-indictment or post-charge line-ups (with a consequent broadening of the use of counselless identification evidence); the preliminary burden of proof on the government to initially prove the voluntariness of confessions was fixed at preponderance of the evidence rather than beyond a reasonable doubt ; and the harmlessness of evidentiary constitutional error was made easier to find