Oswald in the doorway: the blog of the Oswald Innocence Campaign, by Ralph Cinque

More on why Dr. Alen Salerian may be right. This is from the Global Research website:

Mr. Charles Senseney, a CIA weapon developer at Fort Detrick, Maryland, testified before the Senate Intelligence Committee in September 1975 where he described an umbrella poison dart gun he had made. He said it was always used in crowds with the umbrella open, firing through the webing so it would not attract attention. Since it was silent, no one in the crowd could hear it and the assassin merely would fold up the umbrella and saunter away with the crowd.

Video footage of the assassination of John F Kennedy shows this umbrella gun being used in Dealey Plaza. Video evidence of the events of November 22, 1963 shows that the first shot fired on the fateful day had always seemed to have had a paralytic effect on Kennedy. His fists were clenched and his head, shoulders and arms seemed to stiffen. An autopsy revealed that there was a small entrance wound in his neck but no evidence of a bullet path through his neck and no bullet was ever recovered that matched that small size.

Charles Senseney testified that his Special Operations Division at Fort Detrick had received assignments from the CIA to develop exotic weaponry. One of the weapons was a hand-held dart gun that could shoot a poison dart into a guard dog to put it out of action for several hours. The dart and the poison left no trace so that examination would not reveal that the dogs had been put out of action. The CIA ordered about 50 of these weapons and used them operationally.

Senseney said that the darts could have been used to kill human beings and he could not rule out the possibility that this had been done by the CIA.A special type of poison developed for the CIA induces a heart attack and leaves no trace of any external influence unless an autopsy is conducted to check for this particular poison. The CIA revealed this poison in various accounts in the early 1970s. The CIA even revealed the weapon that fired those darts that induces a heart attack at a congressional hearing.