Just in case you read my post, I don't do drugs, never did, never will.
![Grin](https://bitcointalk.org/Smileys/default/grin.gif)
Well, they did not "make the connection", they just started to monitor the guy, as they are probably monitoring hundreds if not thousands of users in these (and many other) forums. They realized that Ross Ullbricht read the same books as DPR, that he like the same youtube videos, that wrote in a similar way... So they waited until they caught him receiving fake ID's and such.
I hope you all realize that being on the internet is like being naked in the middle of your town's main street. If you have something to hide, better not being online at all.
![Undecided](https://bitcointalk.org/Smileys/default/undecided.gif)