Final answer:
The statement that machines identifying colognes from scents on clothing have moved past the experimental phase is the most plausible. Other options lack scientific evidence and practical use in real forensic investigations.
Step-by-step explanation:
Among the statements presented, the most plausible one based on the scientific rigor and technological advancements within the field of forensic investigation would be that machines capable of identifying colognes from scents on clothing are no longer in the experimental phase. The other options, such as technicians pouring caulk into knife wounds to make a cast of the weapon, basing a criminal charge on 'neuro-linguistic programming', or detecting lies through eye movement, lack empirical support or are fictional techniques often seen in crime-related entertainment rather than in real-life forensic practice.
In forensic science, the integrity and accuracy of methods are critical to ensuring justice. While technology plays a significant role in aiding criminal investigations, such as through DNA analysis, not all methods presented in popular media are scientifically approved or used in actual policing.