It looks like they put together the minimum needed to indict, put together a grand jury, indicted and arrested. This was the prosecutor's "ham sandwich" of the week.
The preceding paragraph says "we saw them putting the parcels in the mail box and arrested him"
He might have only admitted to things the cops had seen him do a few minutes before. I can understand someone thinking there was no point in denying such things - although asking for a lawyer would surely be a smarter move.
(For example, this is an Alphabay seller who was selling and distributing fentanyl in Cincinnati two months ago).
https://www.dropbox.com/s/sbsiebzsd6r0f28/bozworth-grace-arr...
It looks like they put together the minimum needed to indict, put together a grand jury, indicted and arrested. This was the prosecutor's "ham sandwich" of the week.