Testing is underway on a suspicious powder that was found at the Palm Beach County State Attorney's Office around 9 a.m. Tuesday.
Samples of the substance have been sent to an FBI lab in Miami to be tested. It could be two days before investigators know what it is.
Three people -- two women and one man -- were sent to the hospital and released.
In a post 9/11 world, it appears many Americans are not willing to overlook anything they deem suspicious and threatening.
In the last year, NewsChannel 5 reported at least six incidents of a suspicious powder being found at locations such as Congressman Allen West's office, the Palm Beach International Airport and Wellington Medical Center.
Dr. Robert Cabello, a professor of international law, says the number of reports show just how vigilant people are with the potential threat of bio-terrorism.
"I don't think you could ever be too cautious," said Cabello. "We see a whole variety of different incidents that continue to occur."
Hazmat crews were called to the State Attorney's Office Tuesday morning after the three employees found the powder in a sealed envelope in the mail processing facility.
"Several employees were exposed to an unknown white substance; it was a powder," said Chase Scott, a spokesperson for the West Palm Beach Police Department.
They complained of headaches and were immediately decontaminated outside before being rushed to the hospital.
The city of West Palm Beach has not said who the envelope was addressed to.
Testing was done on the suspicious powder in the field, but the results were inconclusive.
In the last year, none of the substances found turned out to be anything threatening. However, many believe now is not the time to turn a blind eye.
The State Attorney's Office is not commenting on the investigation.
Their office will be open Wednesday, however the room in which the substance was found will be sealed off until the FBI is done with testing.
The incident at the State Attorney's Office was not the only one in southern Florida Tuesday involving white powder. One man was sent to the hospital after discovering suspicious powder at the National Navy UDT-SEAL Museum in Fort Pierce. A sample from the substance found at the museum was also sent to Miami for testing.