04/05/2012 04:38 pm ET Updated Jun 05, 2012

Justice for George Zimmerman

"Justice for Trayvon" is the rallying cry for those demanding George Zimmerman's immediate arrest in the shooting of Trayvon Martin. Yet forgotten in the rush to punish Zimmerman are the components of true justice: a presumption of innocence, dispassionate evaluation of the evidence, due process and color-blindness. Justice means justice for all, and that means both Martin and Zimmerman.

New evidence continues to complicate a case that the media initially portrayed as clear-cut, turning many Americans against Zimmerman. Let's survey the snags, not to discredit Martin's family's account but to illustrate just how little we know with certainty about Martin's death.

Did Zimmerman racially profile Martin in judging him "suspicious"? Here the distinction between racial profiling and holistic profiling is relevant. Zimmerman's friend Frank Taaffe said young black males had committed a string of recent robberies in the diverse neighborhood. Let's assume that is true. If Martin fit the profile of these specific suspects, was unfamiliar in the neighborhood, and was acting strangely in Zimmerman's mind by walking behind houses, then Zimmerman's judgment was appropriate. It remains uncertain whether Zimmerman, mentor to two black children, uttered a racial slur in his 911 call.

Although Zimmerman made a poor judgment in following Martin, it isn't clear that he wanted a confrontation. Zimmerman's father said his son was only trying to follow Martin until he could locate an address to give police.

Who started the confrontation is also unclear. Martin's family says Zimmerman caught up with, confronted and attacked Martin. Zimmerman's family says that after Zimmerman lost sight of Martin and turned back towards his vehicle, Martin confronted and attacked Zimmerman, breaking his nose and repeatedly smashing his head into the concrete. They say that Zimmerman only drew his weapon and shot Martin after Martin saw Zimmerman's gun in his waistband and verbally threatened Zimmerman's life.

Many claimed police video of Zimmerman that night revealed no clear injuries. Zimmerman, however, had already received first aid and the police report shows that he was bleeding from the nose and the back of his head when police arrived. ABC News recently enhanced the police video to reveal what ABC's Matt Gutman says appear to be "a pair of gashes or welts" on the back of Zimmerman's head. The medical records are not yet released.

There are three eyewitnesses in the case; two corroborate Zimmerman's account. One says he saw Zimmerman, below Martin, crying for help while Martin beat him. Austin Brown, a black teenager, says he saw Zimmerman on the ground "moaning and crying for help." Brown's mother has since said police pressured him into giving more information than he remembered, but he repeated the claim afterwards. She may simply be concerned that her son will suffer backlash like Joe Oliver, a black supporter of Zimmerman, who says he has a "target on my back."A third eyewitness says it was too dark to tell who was who.

Only non-eyewitnesses to the scuffle have corroborated Martin's family's account, but two voice identification experts said the screams in a 911 call during the incident are not Zimmerman's.

Media coverage has favored Martin through selective images, descriptions and context. Many simply reported that Zimmerman "confronted" and "gunned down" an unarmed black teenager. For weeks, old photos of a much younger, smiling Martin were shown beside a mug shot of a much heavier, stony-faced Zimmerman. Few reported that Martin was several inches taller than Zimmerman. Zimmerman's reported weight is outdated; he actually only weighs 170 pounds to Martin's 160, according to Oliver. Zimmerman was labeled "white Hispanic," an unusual term helpful to the racial profiling narrative. Few corrected early reports that vastly overstated the frequency of Zimmerman's 911 calls.

Zimmerman's criminal history was reported quickly, but we only recently learned that Martin was repeatedly suspended from school, including for graffiti; was found with 12 pieces of women's jewelry (which he said belonged to a friend he couldn't name) and a screwdriver (a possible burglary tool) in his backpack; or that he might have punched a bus driver. The Martin family's attorney said Trayvon's past was "irrelevant," yet has highlighted Zimmerman's criminal history.

Most recently, NBC ran an edited version of Zimmerman's 911 call that made it appear that Zimmerman volunteered that Martin was black without being asked, when in reality the 911 dispatcher asked Zimmerman to give the race of the "suspicious person" he was calling about. NBC has since admitted it made an error.

This is a very murky case and we still don't know all the facts. More will be released to the upcoming grand jury that will decide whether or not to indict Zimmerman. If the protests and media spotlight forced the Sanford police department to improve a possibly shoddy initial investigation, great. Now we need to be patient and let the judicial system work.

This post originally appeared in The Harvard Crimson