Why is it so hard to convict liars

Ngā taipitopito rārangi puna kōrero
I whakaputaina i:	Philippine Daily Inquirer (Feb. 20, 2009), A12
Kaituhi matua:	Cruz, Neal H.
Hōputu:	Tuhinga
Reo:	Ingarihi
I whakaputaina:	2009
Ngā marau:	Perjury