User blog comment:The Milkman/Why BioWare HAS Betrayed Us/@comment-1308428-20120405071643/@comment-1308428-20120407215429

I believe Harby boy made a visit to some other galaxy and brought back teleporters. And then lost them playing poker with Joker. And then Joker gifted them to EDI after they... consumed... their relationship. Possibly in the bathroom at the Purgatory bar. Then Gabby lured Javik out of his room while Adams and Donnelly installed the teleporters in there. This all happened while you were on the ravaged Earth that barely had any communications left, talking to EVERYBODY through the comms. That's how Ash/Liara got back on the Normandy. Hey, it's a perfectly plausible explanation in the current Mass Effect series.