| bugging(scrutiny, investigation, monitor, tap) |
| following(scrutiny, investigation, monitor, tap) |
| lookout(scrutiny, investigation, monitor, tap) |
| stakeout(scrutiny, investigation, monitor, tap) |
| watch(scrutiny, investigation, monitor, tap) |
| wiretap(scrutiny, investigation, monitor, tap) |
| body mike(expression, scrutiny, investigation, monitor) |
| close observation(expression, scrutiny, investigation, monitor) |
| direction(scrutiny, investigation, monitor, tap) |
| eagle eye(expression, scrutiny, investigation, monitor) |
| examination(scrutiny, investigation, monitor, tap) |
| eye(scrutiny, investigation, monitor, tap) |
| inspection(scrutiny, investigation, monitor, tap) |
| peeled eye(expression, scrutiny, investigation, monitor) |
| scrutiny(investigation, monitor, tap, shadowing) |
| superintendence(scrutiny, investigation, monitor, tap) |
| supervision(scrutiny, investigation, monitor, tap) |
| surveyance(scrutiny, investigation, monitor, tap) |
| tab(scrutiny, investigation, monitor, tap) |
| tail(scrutiny, investigation, monitor, tap) |