the keys to the kingdom

From the NY Times today:

Al Zelicoff, a physician and expert on biological weapons at the
Sandia National Laboratory in Albuquerque, who is developing a
computerized system to allow epidemiologists to track suspicious
disease outbreaks, said his conversations with federal investigators
had alarmed him.

"These people know what they're doing," Dr. Zelicoff said of the
anthrax terrorists. "I'm truly worried. They have the keys to the
kingdom."

He cautioned, however, that the federal investigation was continuing
and had produced results that were preliminary, with no firm
conclusions.

"But if they have indeed perfected the aerosolizaiton process," Dr.
Zelicoff said of the terrorists, "it's strongly suggested they can do
large-scale dissemination when they wish."