Another peace activist has had a charge thrown out, bringing the number of protesters still facing charges for actions at a defence industry conference to just three.

Photo: RNZ / Kate Gudsell

Fifteen people went on trial in the Wellington District Court at the start of the week on charges of obstructing the police and wilful trespass, relating to their actions outside a Defence Industry Association Conference.

Today Judge Ian Mill threw out charges of wilful trespass against Sean Blair because of insufficient evidence.

Earlier in the week Judge Mill dropped charges against 9 of the 15 protesters after the police case against them collapsed when a key witness, the owner of the defence conference venue the TSB Arena admitted the protest was not on private land.

Charges were then dropped against Selina Van Doorn when video evidence was viewed and after a police witness changed his evidence the case against Jerome O'Connor was also thrown out.

The remaining three activists facing charges are Laura Drew for wilful trespass, Gregory Elliott for resisting police and Stephen Fletcher for obstructing police.

Judge Mill will give his judgements for those three on Monday.