Final answer:
The rule against buoyancy advantage from high-tech body swimsuits could be verified through controlled laboratory tests and actual swimming trials to compare natural and suit-assisted buoyancy levels.
Step-by-step explanation:
The International Swimming Federation, which oversees competitive swimming regulations, ensured that high-tech body swimsuits introduced in 2008 did not provide a buoyancy advantage. To verify this rule, rigorous testing was implemented. One possible method is the use of controlled laboratory tests where the material's buoyancy is measured in a consistent and standardized environment. Additionally, actual swimming trials could be conducted where athletes wear the suits and their buoyancy levels are observed and recorded. These tests would compare the swimmers' natural buoyancy without the suit to buoyancy with the suit to ensure no significant difference.