As reported in Prison Planet (fake truth site of fake truther Alex Jones)

Highly decorated former New York City detective
Bo Dietl admits that his first instinct on 9/11 was that the twin towers
were downed with explosives, as he conceded that he shared many questions
about the official story with 9/11 truth activists he had formerly debunked
on national television.

What started out as a adversarial confrontation with
members of We Are Change turned into a cordial discussion as Dietl contradicted
some of his previous public statements on 9/11 and appeared to agree with
the group on several issues, presumably prompted by the fact that his
daughter was doing a research paper on 9/11 which lent credence to the
suspect nature of the official story behind the attacks.

"I had a perfect view....next thing is I hear screaming,
I looked up and when these are coming down you know what the first thing
I said is? They had fucking bombs in those buildings - I'm telling you
what was in my mind, I said there had to be bombs in the buildings,"
said Dietl.

Watch the video.

"You're talking about two 110 story buildings that
fucking evaporated," said Dietl, adding, "Where are the people....I
ask the same questions it's such a devastating thing."

"Where the fuck did all these bodies go - it was
pulverized - no bones, no DNA was found, I didn't see no body parts"
added Dietl, who was on the scene to help rescue workers and firefighters
shortly after the towers' collapse.

Dietl confirmed that the collapse of WTC 7 was known
ahead of time and that he was told to stay away from the building.

Dietl also described it as a "fucking crime"
that members
of the Bin Laden family were flown out of the country under FBI supervision
in the days following 9/11 when all other air traffic was grounded.

The former detective also mentioned how his former friend
FBI agent John O'Neill, who died in the towers, was prevented by the FBI
from prosecuting Bin Laden and other Al-Qaeda members.

However, Dietl's claim that "they never dreamt in
a million years the tragedy that happened would happen" in the context
of his assertion that the faulty construction of the towers contributed
to their sudden collapse is demonstrably false.

Numerous different World Trade Center designers and construction
specialists are on record as having ruled out the possibility that multiple
commercial jetliner impacts could bring the towers down.

A February 3, 1964 white paper which was written during
the design phase of the towers stated, "The buildings have been investigated
and found to be safe in an assumed collision with a large jet airliner
(Boeing 707 DC 8) traveling at 600 miles per hour. Analysis indicates
that such collision would result in only local damage which could not
cause collapse or substantial damage to the building and would not endanger
the lives and safety of occupants not in the immediate area of impact."

In 2001, Leslie Robertson, one of the two original structural
engineers for the World Trade Center, stated, "The twin towers were
in fact the first structures outside the military and nuclear industries
designed to resist the impact of a jet airplane."

Also in early 2001, Frank
A. Demartini, on-site construction manager for the World Trade Center,
said on camera, "The building was designed to have a fully loaded
707 crash into it. That was the largest plane at the time. I believe that
the building probably could sustain multiple impacts of jetliners because
this structure is like the mosquito netting on your screen door -- this
intense grid -- and the jet plane is just a pencil puncturing that screen
netting. It really does nothing to the screen netting."

Since Dietl still serves as Chairman of the New York
State Security Guard Advisory Council, his comments are of great significance
in the quest for a new investigation.

http://www.thedailyshow.com/videos/tag/Bo%20Dietl

and here's the original heaviness/potato chip theory: