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- Apr 6, 2013
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Jim Armstrong @JimArmstrongWBZ · 2h 2 hours ago
Good morning from courtroom 9...
Day 14 of #Tsarnaev trial about to start. Prosecutors very close to wrapping their case.
Alysha Palumbo @AlyshaNECN · 1h 1 hour ago
#Tsarnaev is in court for the 14th day of his trial. He's sitting at defense table talking with Judy Clarke @NECN
Jim Armstrong @JimArmstrongWBZ · 2h 2 hours ago
#Tsarnaev enters court, rubbing hands together, head down.
Takes seat at defense table, chatty.
Jim Armstrong @JimArmstrongWBZ · 1h 1 hour ago
We begin with witness FBI's David McCollam, a chemist and forensics examiner.
#Tsarnaev
Jim Armstrong @JimArmstrongWBZ · 1h 1 hour ago
McCollam is not an FBI agent, but rather a scientist/forensic examiner who analyzes explosives; chemistry background.
#Tsarnaev
Alysha Palumbo @AlyshaNECN · 1h 1 hour ago
The government's first witness of the day is David McCollam, a chemist forensic examiner with the FBI @NECN #Tsarnaev
Alysha Palumbo @AlyshaNECN · 1h 1 hour ago
McCollam says he and his team analyzed approximately 300 pieces of evidence in the Boston Marathon bombings case @NECN #Tsarnaev
Jim Armstrong @JimArmstrongWBZ · 1h 1 hour ago
McCollam: We can test for "pretty much anything" in the world of explosives.
He says he's tested thousands of samples in hundreds of cases.
Jim Armstrong @JimArmstrongWBZ · 1h 1 hour ago
McCollam coordinated FBI lab efforts as all the marathon bombing evidence arrived at HQ; about 300 pieces of evidence, he says.
Jim Armstrong @JimArmstrongWBZ · 1h 1 hour ago
McCollam: there are high and low explosives. High=military grade. Low=things like black powder from fireworks.
#Tsarnaev
Alysha Palumbo @AlyshaNECN · 1h 1 hour ago
McCollam says explosives are classified into 2 groups - low & high @NECN #Tsarnaev
Alysha Palumbo @AlyshaNECN · 1h 1 hour ago
McCollam: high explosives react faster than the speed of sound, while low explosives react slower than the speed of sound @NECN #Tsarnaev
Alysha Palumbo @AlyshaNECN · 1h 1 hour ago
McCollam says high explosives can be military grade explosives, low explosives can be flares, fireworks @NECN #Tsarnaev
Jim Armstrong @JimArmstrongWBZ · 1h 1 hour ago
A low explosive, he says, can be ignited with a small flame or fuse; high explosives need more.
#Tsarnaev
Jim Armstrong @JimArmstrongWBZ · 1h 1 hour ago
McCollam: a "low explosive" will just burn/smoke, unless it's put into a container. Then, pressure builds and quickly forces an explosion.
Jim Armstrong @JimArmstrongWBZ · 1h 1 hour ago
McCollam: Low explosives can react within fractions of a second.
#Tsarnaev
Alysha Palumbo @AlyshaNECN · 1h 1 hour ago
McCollam: to react low explosives need an oxidizer like a match; high explosives need a shock wave like a detonator @NECN #Tsarnaev
Alysha Palumbo @AlyshaNECN · 1h 1 hour ago
McCollam: high explosives have a black cloud, low explosives release gas & energy to create white cloud @NECN #Tsarnaev
Good morning from courtroom 9...
Day 14 of #Tsarnaev trial about to start. Prosecutors very close to wrapping their case.
Alysha Palumbo @AlyshaNECN · 1h 1 hour ago
#Tsarnaev is in court for the 14th day of his trial. He's sitting at defense table talking with Judy Clarke @NECN
Jim Armstrong @JimArmstrongWBZ · 2h 2 hours ago
#Tsarnaev enters court, rubbing hands together, head down.
Takes seat at defense table, chatty.
Jim Armstrong @JimArmstrongWBZ · 1h 1 hour ago
We begin with witness FBI's David McCollam, a chemist and forensics examiner.
#Tsarnaev
Jim Armstrong @JimArmstrongWBZ · 1h 1 hour ago
McCollam is not an FBI agent, but rather a scientist/forensic examiner who analyzes explosives; chemistry background.
#Tsarnaev
Alysha Palumbo @AlyshaNECN · 1h 1 hour ago
The government's first witness of the day is David McCollam, a chemist forensic examiner with the FBI @NECN #Tsarnaev
Alysha Palumbo @AlyshaNECN · 1h 1 hour ago
McCollam says he and his team analyzed approximately 300 pieces of evidence in the Boston Marathon bombings case @NECN #Tsarnaev
Jim Armstrong @JimArmstrongWBZ · 1h 1 hour ago
McCollam: We can test for "pretty much anything" in the world of explosives.
He says he's tested thousands of samples in hundreds of cases.
Jim Armstrong @JimArmstrongWBZ · 1h 1 hour ago
McCollam coordinated FBI lab efforts as all the marathon bombing evidence arrived at HQ; about 300 pieces of evidence, he says.
Jim Armstrong @JimArmstrongWBZ · 1h 1 hour ago
McCollam: there are high and low explosives. High=military grade. Low=things like black powder from fireworks.
#Tsarnaev
Alysha Palumbo @AlyshaNECN · 1h 1 hour ago
McCollam says explosives are classified into 2 groups - low & high @NECN #Tsarnaev
Alysha Palumbo @AlyshaNECN · 1h 1 hour ago
McCollam: high explosives react faster than the speed of sound, while low explosives react slower than the speed of sound @NECN #Tsarnaev
Alysha Palumbo @AlyshaNECN · 1h 1 hour ago
McCollam says high explosives can be military grade explosives, low explosives can be flares, fireworks @NECN #Tsarnaev
Jim Armstrong @JimArmstrongWBZ · 1h 1 hour ago
A low explosive, he says, can be ignited with a small flame or fuse; high explosives need more.
#Tsarnaev
Jim Armstrong @JimArmstrongWBZ · 1h 1 hour ago
McCollam: a "low explosive" will just burn/smoke, unless it's put into a container. Then, pressure builds and quickly forces an explosion.
Jim Armstrong @JimArmstrongWBZ · 1h 1 hour ago
McCollam: Low explosives can react within fractions of a second.
#Tsarnaev
Alysha Palumbo @AlyshaNECN · 1h 1 hour ago
McCollam: to react low explosives need an oxidizer like a match; high explosives need a shock wave like a detonator @NECN #Tsarnaev
Alysha Palumbo @AlyshaNECN · 1h 1 hour ago
McCollam: high explosives have a black cloud, low explosives release gas & energy to create white cloud @NECN #Tsarnaev