Amendment clarifies that members of investigative teams should be treated as contract employees; clarifies that team members not recommend code changes or further research in the unlikely event that they do not believe any code changes or further research is necessary; expands the types of criminal investigations that would require NIST to stop serving as the lead agency at the site of a building collapse; clarifies how certain decisions of the Director of NIST can be enforced; clarifies that all expenditures in the bill are subject to appropriations; clarifies in two separate places that the bill gives NIST no regulatory authority over the adoption of building standards, codes and practices; and changes the authorization to "such sums as may be necessary".