Bernard Squarcini is suspected of using his police contacts to obtain confidential information about investigations for private clients.
Move comes as documents show that US agents spied on Jacques Chirac, Nicolas Sarkozy and François Hollande, listening to their phone calls.
No official reaction from Paris over claims Angela Merkel's office knew German officials were carrying out economic espionage for the US.
Historian Franck Ferrand says previously unseen documents show the fashion designer worked directly for German military intelligence.
Newspaper report suggests the former state-owned French telecoms giant has been sharing information with security services for many years.
Suspicions raised after suspected winged infiltrator spotted with electronic device ...it was just tracker used to monitor stork migration patterns.
Wikipedia France's most popular article now is about a military installation - the very entry the country's spy agencies allegedly tried to suppress.
Leaked documents suggest former undercover officer is behind allegations that French activists practised making bombs.
Libyan deputy prime minister uses Twitter to announce that Mauritania has agreed to send Abdullah al-Senussi home.