The most overwhelming evidence for Allen’s guilt is that he placed himself on the bridge and he looks like Bridge Guy. According to the affidavit, Allen’s self-identified outfit of a blue jacket and jeans matched that of the suspect. This could, on the one hand, be highly damning circumstantial evidence; if he didn’t realize Libby German had caught him on camera, he’d think nothing of placing himself on the bridge. Then again, he was arguably wearing one of the most generic outfits in Indiana: a blue Carhartt jacket and jeans.
The multiple eyewitness sightings of Bridge Guy are consistent with Allen. One woman claimed to have seen a man who fits Allen’s description looking “muddy and bloody.” Then there are the ballistics. According to the affidavit, an unspent shell casing was found lying between the bodies of the victims — a casing investigators were able to match to Allen’s gun. There’s no mention in the affidavit of DNA, so this could be the best forensic evidence the state presents.
There are several problems with this, however. For starters, the entire field of ballistics evidence is increasingly considered to be
subjective pseudoscience rather than legitimate forensics. And even among already-shaky ballistics, matching an individual gun cartridge to an unspent casing is an extremely rare type of evidence. In
an interview with
The Murder Sheet, one anonymous criminal defense attorney said he’d never seen an unspent shell casing presented as evidence in a trial.