PALATKA, Fla. (AP) - No criminal charges have been filed after 10 stores in Putnam County were raided this week for selling synthetic marijuana.
    
The raid was part of a sheriff's office investigation targeting retailers who sell the drug also known as K-2.
    
The Florida Times-Union reports no charges were filed, but retailers were warned that repeated violations could result in felony charges for sale of the mind-altering substance.
    
The newspaper reported late Friday that Putnam County's operation was launched in response to a July 1 change in Florida law that makes the sale of these synthetic drugs illegal.