Graduate of PMA class of 1986, when in his early years as police officer, he faced the Red Scorpion Gang leader Alfredo "Joey" de Leon.

In a petition granted by the Court of Appeals (CA) in April 2002, he with Aquino, then-chief of operations of PAOCTF, and P/Sr.

The daughters used the Torture Victim Protection Act, allowing US courts to hear human rights abuse cases committed outside the said country.

[19] He later run for a party-list spot within the banner of Kilusang MAYPAGASA with the initiative of police officer's welfare, and peace and order, but lost again.

[20] He was named head of DICT’s cybercrime center with the rank of Executive Director V.[21][22] Mancao was featured in 1993 film Mancao starring Philip Salvador that features his encounter the syndicate Red Scorpion Gang leader Joey de Leon.