DiBiagio was covering something up. He was covering up that he was trying to get rid of Luna. It is in the second article linked in my previous post.
As for the tracing, he had EZ Pass on his car and his route was traced, because he took toll roads. Luna took a round about and traceable route to where he ended up.
Luna went from Baltimore, north on I-95, drove through Delaware, crossed the Delaware River at some point and went into New Jersey. He then crossed the Delaware again near Florence and hit the Pennsylvania Turnpike north of Philadelphia.
Doing that would take about 2 hours (+/- 15 minutes), and 130 miles. He was found some distance from there, outside of Denver, PA, about another 45 miles, and 50 minutes. Had he gone north on I-83 and turned east of US Route 30 at York, then taken US Route 222 east, it would have taken him about 1 hour 40 minutes, the distance is 95 miles. I think the only place where he could have been traced by using EZ Pass was while he was still in Baltimore.
If he was meeting someone at the site where he was found, he took a roundabout way that was more traceable. If he wanted to be traced, he could have taken his cellphone and used it.
He stopped for gas in King of Prussia (along the Turnpike) and at least one person saw him alive, IIRC.