It's not IF, ALL checked luggage are x-rayed by customs at ALL international airports when they get out of the plane and enter the luggage system (in particular is our western airports, but also in Manila). This explain sometimes why we are waiting the luggage ... a long time...
If it's to be inspected, they add a discrete marking.
As well as carry-on at the arrival but with your presence; but not in Manila (Terminal 1)!
Medicine transportation is submitted to special rules to avoid (or limit) trafficking (to be checked with leaving and arriving countries rules).