The Whale Watch operation was temporarily forced out of business after the 7.8 earthquake, but is now back in operation.
Scientists will begin testing wastewater from communities across New Zealand to find hotbeds of P, heroin, cocaine, ecstacy and bath salts.
Up to 900 former and current construction and manufacturing workers die from breathing in airborne contaminants each year.
Healthy adults in the Southern DHB and Counties-Manukau DHB regions will be the next to benefit from the nationwide screening programme.
Libby Burgess, campaigner for Breast Cancer Aotearoa Coalition, is calling on the Government to fund modern drugs.
Moana Papa of Auckland is among those pleading for Pharmac to approve funding for advanced drugs so she can spend more time with her family.