таємне підслуховування; приховане підслуховування (прослуховування)
intelligence eavesdropping / wiretap
check for eavesdropping devices
eavesdropping
eavesdropping device
eavesdropping devices
electronic eavesdropping device
installed eavesdropping device
surreptitious movement
surreptitious chemical weapons capability
surreptitious entry
surreptitious listening
surreptitious listening device
surreptitious method
surreptitious operation
surreptitious smoking
surreptitious testing