Background - On June 26, 2016 Nathan Cornell was assaulted; criminal complaints charged Tyler Kristian Mangel (and separately Matthew Craft) with aggravated assault, simple assault, and harassment. - The Commonwealth sought Facebook records and screenshots of a Facebook account for “Tyler Mangel” (including undated chat screenshots and a posted photo of bloody hands) and obtained Facebook/Verizon subscriber records. - Detective Anne Styn (computer forensics) compared Facebook account content and subscriber records to the screenshots but conceded she could not say to a reasonable degree of scientific certainty that Mangel personally authored the posts (no IP address, no password, no direct proof of access). - Defense demonstrated multiple Facebook accounts under the name “Tyler Mangel” and disputed the uniqueness of the account the detective located; trial court admitted the hearing exhibits but denied the Commonwealth’s motion in limine to admit the Facebook items at trial. - Commonwealth appealed, arguing the trial court applied an overly strict “reasonable degree of scientific certainty” standard and that authentication requires only proof permitting a jury to find authenticity by a preponderance of the evidence. ### Issues | Issue | Plaintiff's Argument | Defendant's Argument | Held | |---|---:|---:|---| | Whether the trial court applied an improper, higher-than-required standard for authenticating Facebook records | Commonwealth: trial court required unreasonable “scientific certainty”; authentication needs only that a jury could reasonably find authenticity by a preponderance | Defense/Trial court: under Pa.R.E. 901 and Koch, proponent must supply direct or circumstantial evidence tying account/posts to defendant (more than just name/photo) | Court: No error — trial court applied correct Pa.R.E. 901 framework; Commonwealth failed to present sufficient direct/circumstantial evidence that Mangel authored the posts | ### Key Cases Cited In re F.P., 878 A.2d 91 (Pa. Super. 2005) (electronic messages authenticated case-by-case under Pa.R.E. 901) Commonwealth v. Koch, 39 A.3d 996 (Pa. Super. 2011) (electronic communications require corroborating circumstantial evidence to establish authorship) United States v. Browne, 834 F.3d 403 (3d Cir. 2016) (social-media communications may be authenticated by a range of evidence permitting jury to find authenticity by a preponderance) United States v. Vayner, 769 F.3d 125 (2d Cir. 2014) (profile printout alone insufficient to authenticate social-media account as defendant’s)