1 Box (25). Oral Drug Test. The all new iScreen Oral Fluid Device. A saliva test device that tests for (COC, THC, OPI, mAMP), this product is an easy to use saliva based multi drug test. The iScreen OFD (oral fluids device) is a revised product adding the simplicity of a one piece-one step oral fluids screen that provides fast accurate results. iScreen OFD does not require special training but does come with a training CD to assist your staff.