However, prisoners and staff had developed a variety of methods for getting substances past security systems, even using drones to fly them in.
"We will continue our discussions with your government over the substance of our security arrangements, including areas of training, intelligence and counterterrorism," he said.
And with Facebook having already revealed a second breach that's potentially even larger than Cambridge Analytica fresh focus and political attention is falling on the substance of its security practices, not just its claims.
Passengers might be allowed, for instance, to carry on small bottles of perfume or perhaps other substances that pose little security threat because of their size.
Rios said one thing a hacker could have done is remove one or two items from the list, so the removed substances could pass through security.
And Mrs Clinton will take every opportunity, not least in two forthcoming debates, to attack him on substance, particularly about national security and the economy.
While the summit meeting of the other European Union leaders on Friday in Bratislava is expected to produce little of substance, its theme is "security," including borders, migration, terrorism and further defense cooperation.
Positions in fields that are growing, Mr. Challenger said, involve direct contact with consumers -- from home health care aide to substance abuse counselor to security guard, among many others -- which offer some of the best opportunities because they have to be done locally and "are not going to go global".
In this review, recent and significant advances in GC×GC for application to forensic studies including human scent, arson investigations, security-relevant substances and environmental forensics are discussed.
The use of this band has been proposed for high-speed data links, automotive radar, radar imaging, security screening, substance identification, and non-destructive testing among others [1 3].
