But a body in the street offers less. Kill a man while he’s walking to the liquor store and you can rest assured that no civil servant is going to suck the lint from the 2500 block of Division Street. Shoot a man outside and there’s a good chance that most of the projectiles will not be recovered. Kill someone in the street and often the crime scene will provide a detective with little more than some blood spatter and a couple of spent casings. Not only are the opportunities for recovering physical evidence fewer, but the spatial relationship between the killer, the victim and the scene is obscured. With an indoor murder, the killer and victim can both have discernible connections to the location; out in the street, a detective can’t check utility bills or rental agreements to learn the names of people associated with his crime scene. He can’t collect the photographs and loose paper, telephone messages and notes scrawled on pieces of newspaper that would be waiting for him at an indoor murder.

Of course, a detective knows that a street murder carries its own advantages, notably the possibility of witnesses, the second element of the investigative triad. For this reason, one alternative has long held a special place in the catalogue of urban violence, particularly in a rowhouse city such as Baltimore, where every block has a rear promenade. Kill someone in an alley and you minimize the risks of both physical evidence and witnesses. In Baltimore, the report of a body in an alley is bound to bring groans and other guttural noises from the throat of a responding homicide detective.

Only one scenario, in fact, offers less hope than a body in an alley. When a Baltimore homicide detective is called to the woods and brambles along the far western edge of the city, it can only mean that one of the city’s inhabitants has done a very bad thing and done it very, very well. For two generations, Leakin Park has been Baltimore ’s favored dumping ground for those who depart this vale by bullet or blade. A sprawling, thickly wooded wilderness surrounding a small stream known as the Gywnns Falls, the park has been the scene of so many unlicensed interments as to warrant consideration as a city cemetery. In New York, they use the Jersey marshes or the city’s rivers; in Miami, the Everglades; in New Orleans, the bayou. In Baltimore, the odd, inconvenient corpse is often planted along the winding shoulders of Franklintown Road. Police department legend includes one story, apocryphal perhaps, in which a class of trainees searching one quadrant of the park for a missing person was reminded by a Southwestern District shift commander, with tongue planted in cheek, that they were looking for one body in particular: “If you go grabbing at every one you find, we’ll be here all day.”

Veteran detectives declare that even the most unremarkable crime scenes offer some information about the crime. After all, even a body in an alley leaves a detective with questions: What was the dead man doing in that alley? Where did he come from? Who was he with? But a dump job, in Leakin Park or in an alley, in a vacant house or a car trunk, offers nothing. It stands mute to the relationship between the killer, the victim and the scene itself. By definition, a dump job strips a murder of any meaningful chronology and-with the exception of whatever items are abandoned with the body-of physical evidence.

Whatever and wherever the scene, its value as the baseline of a murder investigation depends entirely on the detective-his ability to keep out the rabble and maintain the scene itself; his capacity for observation, for contemplating the scene in its totality, in its parts, and from every conceivable angle; his willingness to perform every task that could possibly yield evidence from a particular scene; his common sense in avoiding those procedures that would be meaningless or futile.

The process is subjective. Even the best investigators will admit that no matter how much evidence is pulled from a scene, a detective will invariably return to the homicide office with the discomforting knowledge that something was missed. It is a truth that veterans impress upon new detectives, a truth that emphasizes the elusive quality of the crime scene itself.

Whatever happens before the scene is secured can’t be controlled and in the wake of a shooting or stabbing, no one objects to the behavior of uniformed officers, paramedics or bystanders who alter a scene in an effort to disarm the participants or administer aid to the victim. But apart from such necessary actions, the first uniform at the site of a murder is supposed to preserve the scene from being trampled, not only by the locals, but by his fellow officers as well. For the first officer and those who arrive after him, good police work also means grabbing hold of any potential witnesses who happen to be standing around.

The first officer’s duties end upon the arrival of a downtown detective, who, if he knows his business, will start by slowing everything down to a crawl, making it much more difficult for anyone to express stupidity in any truly meaningful way. The more complex the scene, the slower the process, giving the detective some semblance of control over the uniforms, the civilian witnesses, the bystanders, the crime lab technicians, the ME’s attendants, the secondary detectives, the shift commanders and every other human being in the vicinity. With the exception of the civilians, most of this crowd will know the drill and can be trusted to do their jobs, but as in everything else, assumption is mother and midwife to the most egregious mistakes.

Before this year is out, a detective on Stanton ’s shift will arrive at a scene to find that a novice team of paramedics has taken a dead person-a very dead person-for a last ride to a nearby emergency room. There they will be told that it is hospital policy to accept only those patients who are at least clinging to life. The flustered paramedics will mull this over and then decide to take the body back to the street. Upon their return to the death scene, this plan will be given tentative approval by the uniforms, who assume that the ambulance crew must know its business. No doubt the officers would then have done their best to place the cadaver in its original position had not the detective arrived to say thank you, but no thank you. Let’s just say the hell with it and take the poor guy down to the autopsy room.

Likewise, Robert McAllister, a seasoned detective and a veteran of several hundred crime scenes, will soon find himself standing in a Pimlico kitchen above the blood-soaked body of an eighty-one-year-old man, stabbed forty or fifty times in a brutal housebreaking. On a dresser in a back bedroom is the bent-blade murder weapon, caked with dried blood. So preposterous is it that anyone would disturb such a glaring evidentiary item that McAllister will think it unnecessary to warn against doing so. This crime of omission ensures that a young officer, fresh to the street, will wander into the bedroom, pick up the knife by its hilt and carry it into the kitchen.

“I found this in the bedroom,” she will say. “Is it important?”

Assuming that such calamities are avoided and the scene preserved, what remains for the detective is to find and extract the available evidence. This is not done by vacuuming every room, fingerprinting every flat surface, and taking every beer can, ashtray, shred of paper and photo album down to evidence control. Discretion and common sense are valued as much as diligence, and a detective unable to discern the differences among probabilities, possibilities and the weakest kind of long shots soon finds that he risks overloading the evidence recovery process.

Remember, for instance, that the overworked examiners in the ballistics lab are weeks behind on projectile comparisons. Do you want them to compare your.32 slug with other.32-caliber shootings this year, or should they go back another year? Likewise for the fingerprint examiners, who in addition to the open murders are handling latents from burglaries, robberies and half a dozen other types of crime. Do you tell the lab techs to dust surfaces in rooms that seem to be undisturbed and apart from the scene, or do you have them concentrate on objects that appear to be moved and that are close to the death scene? When an elderly woman is strangled in bed, do you vacuum every room in the house, knowing how long it will take the trace lab to go through one room’s worth of dirt and lint, hair and fiber? Or, knowing that there wasn’t any far-flung, room-by-room struggle, do you instead have the ME’s people carefully wrap the body in the sheets, preserving any hairs or fibers that came loose during the action near the bed?