A warning if you're having a cuppa joe when you fill out your census form: Be careful not to get any creamer in the envelope.
A census data processing center in Essex, Md., was quarantined Tuesday when a worker found an envelope with white powder in it.
About 520 employees were moved elsewhere in the building while the substance was investigated. The facility was never shut down or evacuated.
The white powder turned out to be coffee creamer.
There was also a coffee stain on the form.