It's pretty easy to understand why Philadelphia Police Officer Albert Lopez failed to appear in court, four times, for the case of Commonwealth of Pennsylvania v. Agnes Lawless. He'd have been charged with obstruction of justice or perjury when this video emerged as evidence:
Officer Lopez entered the store with his son and got into a physical confrontation with Lawless. Lawless ended up in cuffs, charged with assaulting Lopez.
At a preliminary hearing four days later, Officer Lopez testified that he'd come into the store and ordered Lawless and the three young men with her to the floor, and that "she freaked out, started punching, slapping and kicking me multiple times."
Lawless, who'd been involved in a minor fender bender with Lopez's son a few minutes earlier, was charged with assaulting an officer as a result of the altercation shown above. She'd scraped the barrel of Lopez's revolver with the back of her neck.
As mentioned, it's easy to understand why Lopez failed to testify against her when video emerged. What's difficult to understand is why Lopez still has his job, as do the other Philadelphia cops who pressured the store clerk to erase the videotape.
Philadelphia is fast surpassing Los Angeles as the last city in America where a law-abiding citizen would want to encounter a cop. If it was ever behind Los Angeles in the first place.