In 1970, the District of Columbia passed the first __________ statute which

authorized denial of bail to "dangerous" persons charged with certain
offenses for up to 60 days.

http://legal-dictionary.thefreedictionary.com/preventive+detention

I'm looking for this same question...

i believe its delayed bail

Preventative detention

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From my knowledge, the answer to your question is that in 1970, the District of Columbia passed the first "Bail Reform Act" which authorized the denial of bail to "dangerous" individuals charged with certain offenses for up to 60 days. This was an important step in criminal justice reform and allowed the temporary detention of individuals who were deemed a risk to public safety.