The best replacement for secret service is fbi.

The best alternatives to secret service are rated as following:
★★★★★  fbi
★★★  cia
★★  dss
★  us marshal
★  capitol police
★  diplomatic security
★  swiss guard
  us marshals

Your alternative for secret service is not listed? Suggest!
Speaking about secret service, one probably shouldn't forget about bush.

Other search terms related to secret service and their ratings are:
★★★★★ bush
★★★★ president obama
★★★★ prostitutes
★★ former presidents
★★ malia
★ romney
★ ex presidents
You have in mind a companion for secret service and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of secret service in all years. Click on graph for more.
secret service
fbi
cia