A constitutional amendment that would save $2B a year

From the Economist:

The constitution calls for an “actual enumeration” of the population. That may make newfangled census methods vulnerable to challenges from the courts. A Supreme Court ruling already limits the use of statistical sampling, which adjusts survey data to include more accurately minorities, who are generally undercounted by older methods. In December the Government Accountability Office noted that the census’s cost has on average doubled each decade since 1970. Without “fundamental reforms”, the next one could cost $30 billion. [Emphasis added.]

How about this for a simple, massively cost-saving Constitutional Amendment:

The decennial census shall be conducted using modern statistical methods.