Yes I agree partially that FIA's Asst. Director is more Powerful then PSP's SPO Same Grade BS-17, FIA's Officer work in a solo dimensions and are the most skilled in Scientific Investigations, while He work could arrest even PSP's DMG's mostly they were on assignment such as, last month during Ramdan Jung and The News publish a news that Custom Officers were arrest on the behalf of taking bribe at Karachi Air Port, were arrest by Asst. Director FIA, where as they have no uniform that's mean they works undercover of civil dresses, They have the most advance training of Pakistan from FIA Training Center, of various subjects such as Forensics, Cyber Crime Fighting, Biometric Identification and many where as one SPO know good enough about Police Manuals where as nothing about Scientific Investigation, Investigation under SPO is done usually by ASI. Where as PSP Officers get more Promotions then FIA's BPS 17 Officer, More Accommodations and Privileges such as Car, House and Magisterial Staff then FIA BPS 17 Officer. While there is no Deputation allowed from FIA to PSP, where as PSP could be Reassigned as Deputation Officer at FIA. FIA Officers are like Kings without Crown.

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-Better an ounce of luck than a pound of gold.
--Yiddish Proverb