Criminal sentence is supposed to be just reflection of the gravity of the violations of social norms by an individual in given circumstances. It therefore should be a reliable base for measurement of antisocial tendencies in offenders. Decades of research consistently show that autonomic under-arousal is a significant predictor of crime, violence and antisocial behaviour (AB). No research to date tried to study relationship between length of criminal sentences and physiological measures of autonomic nervous system (ANS) activity. Our study aimed to check if parameters of criminal sentences are good quantification of antisocial tendencies by correlating it with their known physiological correlate – resting heart rate (HR). We correlated sum of sentences, largest individual sentence and legal limits for most serious offence as documented in criminal records with resting HR in 74 young adult incarcerated criminal offenders aged 18–20. In line with the hypothesis we obtained Pearson’s coefficients of r = -.443; r = -.451 and r = -.397 respectively as well as Spearman’s coefficients ρ = -.408; ρ = -.492 and ρ = -.406 respectively, all significant at p .001.
Our research shows that resting heart rate can be a robust predictor of criminal conduct when the latter is quantified precisely and objectively with criminal records. This directs further research in this field towards measuring AB using methods less sensitive to impression management and informant bias, not relying on self-report but on documented behaviour vides empirical support to the validity of codified principles of criminal law as ways of expressing offenders’ level of social misconduct.

This paper presents ‘jigsaw fit’ analysis, which is an aspect of mechanoscopy (tool mark examination) helpful in solving difficult forensic cases. Its use can lead to categorical conclusions in the reconstruction of the course of an incident. Examinations of this kind entail the matching of items separated due to breakage, fracture or tearing. The task of an expert in this field is to resolve the question of whether or not the items belonged together before they were separated. This paper describes three examples of cases involving ‘jigsaw fits’.

Fingerprints are the friction ridges found on the fingers and palm of hands. These prints are considered the most valuable evidence in the court of law as these ridges provide uniqueness to every individual. Powder dusting is one of the prevalent approaches to developing fingerprints on various surfaces. This involves the application of finely formulated powders on the fingermark impression using a camel hair brush. in this article, we have used organic household waste materials like rose and hibiscus petals for developing the powders used in latent fingerprints development. The particle of powder gets adhered to sweat and moisture deposited on the surface of fingers, palm, and sole, which provide effective visualization and give the fingerprint details (minutiae). Finally, the formulation of the powder sticks to the ridges, and the excess powder is blown away. The powder is multicolored in this case, the patterns are apparent, resulting in an exceptional outcome. The objective of the study is to provide a replacement to the conventional, expensive and toxic laboratory powders. These organic powders are easily available, eco-friendly, cost-effective and non-toxic approach for latent fingerprint development and is a reliable technique to use at crime scene and future use.

The impact of marijuana on road safety has been the subject of many debates over the years. These debates have intensified in recent years due to initiatives carried out in several jurisdictions aimed at marketing medical cannabis. According to Polish forensic toxicologists, road safety is a key issue, especially following the conferences in November 2012 in Kraków and in 2013 in Augustów (Gieroń et al., 2013), Poland, on the determination of appropriate concentration thresholds. These thresholds, defining the limit for the ‘after use’ and ‘under the influence’ conditions, are still not unambiguous or easy to determine for the Polish government. An unambiguous assessment of the impact of a given concentration of blood THC on psychomotor performance is very difficult, and will remain so in the foreseeable future. This study used 107 randomly selected blood collection protocols, with 10 protocols for each THC concentration ranging from 1 to 10 ng/ml, on the basis of which thirteen features related to the external appearance and behaviour of the tested individuals were analysed. These features were: facial skin (pale, normal or red), slurred speech, mood and behaviour (cheerful, talkative, rowdy or reticent), heart rate, pupils (normal, dilated or contracted), reaction of pupils to light, the Romberg test, the finger-to-nose test, picking up objects from the ground and awareness of time and place. Five of the thirteen features related to the appearance and behaviour of the respondents showed no abnormalities (gait, the Romberg test, the finger-to-nose test, picking up objects from the ground, and awareness of time and place). The study found that the symptoms observed and recorded in the protocols are insufficient to make a decision about the impact of THC on psychomotor performance. The characteristic symptoms (cheerfulness and talkativeness) occurred no more frequently than in 3 out of 10 of the concentrations tested.

The reliability of evidence in a criminal trial is a multidimensional issue and relates to the assessment of the evidential value of a specific circumstance established in the case through activities performed by expert witness or authorities. The reliability (trustworthy) of the source of evidence and identification methods, performance of research, deduction and the context of other evidence seem to be one of the important implications for the evidential value.
Results of the survey of participants of the criminal trial (police officers, prosecutors and experts) and comparative group on the perception of various features of identification methods and selected aspects related to the status of a forensic expert is presented in the article. In the first part of the study, the identification methods were ranked in terms of their scientificity, reliability and willingness to convict on the basis of the method’s results. The research shows that the assessment of the method’s reliability is significantly correlated with the assessment of its scientificity. However, some exceptions to this relationship have been identified, indicating that the reliability of the method may also be the result of an assessment of its suitability and effectiveness. The second part of the research was focused on assessing the reliability of various expert opinions. The place of examinations carried out by an expert is important for the participants of the criminal trial. Opinions of forensic experts performed at specialist institutions were assessed as the most reliable.