Which of the following is not an antibiotic screening test for Beta Lactam drugs in raw milk?

The correct answer indicates that the option mentions an "Assay test" which is not specifically categorized as a standard antibiotic screening test for Beta Lactam drugs in raw milk.

In this context, a genetic test is employed to identify genetically resistant bacteria or the presence of antibiotic resistance genes, which can influence the safety and quality of milk. A screening assay is a method specifically designed to detect the presence of antibiotics, including Beta Lactam medications, and is a common tool in quality control. Visual inspection may not be a formal screening test but can be utilized to observe physical milk characteristics that may indicate contamination or spoilage.

The term "Assay test" is rather vague. It may refer to a broad spectrum of analytical methods but does not directly imply a specific screening test recognized in antibiotic detection protocols for milk. Thus, it is the least accurate choice for identifying a method specifically for detecting Beta Lactam drugs among raw milk testing techniques.