Oral fluid collection article

An oral fluid collection article for placement entirely in the buccal cavity of an individual for collection and filtering of a saliva fluid sample comprising:

• a semi-permeable membrane container defining an enclosed chamber, said semi-permeable membrane container having pores which are of a size to allow desirable oral fluid molecules to pass through, said pores acting as a filter for filtering out of larger undesirable particulate or molecular matter from said saliva;
• and osmotic substance means being disposed in said enclosed chamber for creating an osmotic pressure system inside of said chamber and for drawing oral fluid from said buccal cavity through said container and into said chamber of said semi-permeable membrane container and retaining at least a portion of said fluid in said chamber.