How many cops drive under the influence?

Just take a look at the articles on www.DWIHitParade.com today...

Arkansas: troubled trooper quits after DUI arrest

Pennsylvania: why wasn’t this boneheaded state trooper fired after his 1st DUI arrest? Trooper arrested again!

North Carolina: Deputy quits after his arrest for DWI

Ohio: Trooper too happy on way home from Halloween party now quits after DUI arrest

Should law enforcement officers (troopers, deputies police officers) be subject to random testing for alcohol and drugs?