Latent Fingerprint Visualization using a Scanning Kelvin Probe in Conjunction with Vacuum Metal Deposition

The application of vacuum metal deposition before scanning Kelvin probe visualization of fingerprints is investigated. The potential contrast between fingerprint ridges and furrows is maximized by the use of silver deposition for non‐noble metals and gold–zinc deposition for noble metals. The higher susceptibility of eccrine fingerprints to vacuum metal overdeposition is confirmed. Additionally, fingerprints are best developed individually and by building the metal deposition slowly to protect against overdevelopment and variation in the rate of metal condensation. The progress of the metal deposition can be monitored using the scanning Kelvin probe by reference to the change in potential and continuity of the new potential on the surface. The use of acetic acid solution for the recovery of overVMD‐developed samples is shown not to be useful. Applying the metal deposition has the additional prospect of increasing surface conductivity and homogeneity and both can aid fingerprint visualization using the scanning Kelvin probe.     

Why a Jury Trial is More Like a Movie Than a Novel

This essay is concerned to note the way in which successful trial advocacy seems to stem from the ability to convert legal discourse into a story form. These stories need to be ones with which a jury is familiar. These increasingly come from visual media, particularly film. It looks in detail at one trial where this process of relating a defence to the jury employed the structure of a Mafia film. The essay concludes by examining the reasons why the nature of the novel differs significantly from that of the film and how in the novel-to-film adaptation process a certain simplification is bound to occur.     

Communications

David Schlosberg, 'Communicative Action in Practice', Political studies (1995) XLIII, 291–311