Direct hires (did not use an agency) or also known as name hires - POLO verification depends on the occupation.
Here is the list of classes of workers (name hires) that indicate if POLO is required (currently only
http://www.poea.gov.ph/ARTA_ISO/Namehire.pdf
If your occupation does not fall under these, or if unsure, call up or visit a POEA office near you.