HA! We have portable fuel analyzers, Inspectors trained in their use and a standing contract with DNV to analyze submitted samples. The budget has been increased for sulphur and nitrous oxide emmisions (NOX & SOX) and annex VI of MARPOL will be enforced. Every ship entering Eastern Canada reports ROB of fuel, including sulphur content. I check all their declarations. Any obvious discrepancies (eg 25 tonnes of compliant fuel on a ship bound for Montreal is flagged and checked at Montreal.
Any complaint of excessive emmissions are investigated. In either case, the fuel would be sampled at the engine (not in the day tank) and if the sample doesn't agree with the declaration, the sample is sent to DNV for analysis. If DNV confirms the sulphur content is too high, we have various actions we can take, from Criminal Code for providing milsleading or untrue information, to detention, to holding a deposit equivalent of the maximum fine ($1 million)
And it's happenng NOW.
Discourage incest, ban country "music".