Before the thread gets too off track, and back to the OP question, I think it is everyone's responsibility in the supply chain's responsibility to attempt to control pests. No one is perfect and the pests are after all naturally occurring, its not as though anyone is adding them intentionally-if someone knowingly sold something infested that is a different issue and proving they actually knew for sure might be difficult, but that is another issue entirely from the OP question IMO. It is everyone's responsibility in the supply chain. Not trying to hold myself up as perfect, but I set up a collection station in Tahiti and as part of that process set in place a strict policy for fish. Every fish goes through several freshwater dips, copper treatment, and antibiotic treatment and is held and eating before being shipped. Now this takes time and costs, in this process fish can be held for several weeks before being exported. Then once here in the US they are acclimated and held in isolated tanks and treated as needed. Then once a hobbyist buys that fish it must be in QT and treated as needed. Even though all that work goes into the treatment and handling is done beforehand it is still the responsibility of the hobbyist to protect their tank and investment. Even if all the previous steps were perfect, stress occurs during shipping that can lead to illness and therefore QT is vital. Pests on corals can be very difficult for a collector, exporter, wholesaler, or even vendor to notice despite doing regular preventative treatments. Any larger vendor can handle literally thousands of corals weekly, not making any excuses and not saying we are perfect, but for corals I would say the reality in our industry would be the burden would tend to fall more on the hobbyist with corals. Again, that is not to excuse anyone not doing regular prevention and treatment but the fact that lifecycles of pests and the shear volume being dealt with no on can absolutely guarantee 100% pest free. Every vendor should have protocols in place, but to expect 100% control of naturally occurring pests is unrealistic. Everyone is responsible, but ultimately it is your investment of time and hundreds to tens of thousands of dollars so always QT, inspect, treat regardless of vendor or hobbyist you get anything from.