You asked me why I think the FBI investigation was a poor investigation and poor police work so I'll tell you from the Michael Griffiths website. I suppose somebody will now go complaining to the moderator about it.
I have always said that I don't think Oswald was completely innocent. I have also always believed he wasn't a lone gunman. It was never esatablished beyond reasonable doubt by forensic tests that Oswald fired a rifle that day, or that he killed Officer Tippit. In any fair trial Oswald would have gone free, if there was an extremely competent judge.
With regard to the Italian rifle it is mentioned on this website:
http://www.giljesus.com/jfk/window.htm
Some say Oswald was carrying his lunch in the paper bag, though I'm not sure about that. The eyewitnesses certainly got the measurements wrong.
This is what Michael Griffiths posted on his website about the fingerprints. I think this could be true.
Fingerprint Evidence
"A certified fingerprint expert has determined that convicted killer Malcolm "Mac" Wallace left a fingerprint in the sixth-floor sniper's nest on the day of the assassination. On the afternoon of the shooting, the authorities found a fingerprint in the sixth-floor window that they were never able to identify. It didn't belong to Oswald, and it didn't belong to any other employee in the building nor to any of the law enforcement personnel who searched the sixth floor. In 1998 fingerprint expert A. Nathan Darby identified the mystery print as belonging to convicted killer Mac Wallace. Darby found a 14-point match between the sixth-floor fingerprint and Wallace's fingerprint.
Darby is a certified Latent Print Examiner with impressive credentials and years of experience. In addition to his training and awards, Darby has testified as an expert witness on fingerprint identification in numerous court cases. Darby states in his notarized affidavit that he found fourteen matches between the previously unidentified fingerprint from the sixth-floor sniper's nest and a fingerprint card that contained the fingerprints of Mac Wallace. It should be pointed out that Darby did not know whose fingerprints were on the fingerprint card. He was asked to compare the fingerprints on the fingerprint card with the unidentified fingerprint from "Box A" from the sixth-floor window. Darby wasn't aware the fingerprint card bore Mac Wallace's fingerprints until after he'd made the identification.
Who was Mac Wallace? Wallace was convicted in a 1951 murder and was suspected in others. He was also linked to the 1961 death of U.S. Department of Agriculture investigator Henry Marshall. Marshall was reportedly close to connecting then-Vice President Lyndon Johnson to fraudulent activities involving businessman and convicted swindler and millionaire Billy Sol Estes. Estes was a key Johnson associate who funneled millions of dollars into a slush fund for LBJ.
Estes alleged in 1984 that LBJ ordered the killings of Marshall and President Kennedy, among others, and that Wallace carried them out. A grand jury decided that same year that Henry Marshall was murdered as a result of a conspiracy involving then-Vice President Johnson, his aide Clifton Carter, and Mac Wallace. No charges were possible since all three men were by then deceased.
A few fingerprint identifiers have challenged Darby's identification. However, none of them has Darby's experience or credentials. The FBI, after having the prints for a year, verbally informed an attorney associated with the Wallace fingerprint project that the bureau had not found a match between Wallace's print and the sixth-floor print. The FBI issued no report and did not disclose who had examined the prints or what was involved in the review process. The researchers involved with the Wallace fingerprint identification were wholly unimpressed with the FBI's belated, undocumented claim. Students of the JFK case are aware of the FBI's awful, abysmal track record in dealing with evidence relating to the assassination. Even way back in 1964 one of the members of the Warren Commission complained the FBI had already rushed to judgment and that it didn't want to consider any alternative views. Within days, even hours, after the shooting, the FBI became obsessed with proving the assassination was the work of one man acting alone. On more than one occasion, FBI officials have been caught giving out false information about evidence relating to the JFK case, such as when the Dallas FBI office falsely claimed the Tague curb scar had been obliterated by rains and/or street cleaners. The FBI's crime lab has been rocked by serious charges of fraud and evidence tampering. Some of these charges have come from a highly regarded scientist who worked in the FBI's crime lab. Much more could be said about the FBI's performance on matters pertaining to the Kennedy assassination. For now suffice it to say that any FBI challenge to the fingerprint evidence deserves to be viewed skeptically from the outset, given the bureau's miserable track record on the JFK case.
If the unidentified fingerprint from Box A from the sniper's nest is not Mac Wallace's fingerprint, then whose is it? If nothing else, the Box A fingerprint suggests a second person was in the sniper's nest. The print must have been placed on the box no more than 24 hours before it was lifted by the police. As mentioned, the print didn't belong to Oswald, nor to any of his fellow employees, nor to any of the police personnel who searched the sixth-floor window. It should be mentioned that several witnesses in Dealey Plaza reported seeing two men in the sixth-floor window shortly before the motorcade arrived in the plaza, and that another witness saw someone moving boxes around in the window a few minutes after the shooting. This could not have been Oswald, since a policeman and a building manager saw Oswald in the second-floor lunchroom calmly standing near a soda machine less than two minutes after the shots were fired."