Congressional Budget Office Cost Estimate: H.R. 3209: Anti-Hoax Terrorism Act of 2001 [open pdf - 7KB]
"H.R. 3209 would establish a new federal crime for the perpetration of hoaxes involving the threat of biological agents or other weapons of mass destruction. Offenders would be subject to imprisonment and criminal and civil fines. Under the provisions of H.R. 3209, the government would be able to pursue cases involving hoaxes that it otherwise would not be able to prosecute. Because there are similar prohibitions on hoaxes in current law, however, CBO expects that the bill's provisions would probably affect a small number of additional cases. Thus, any increase in costs for law enforcement, court proceedings, or prison operations would not be significant."
Congressional Budget Office: http://cbo.gov