A victims advocate says while thousands of violent sex crimes reported each year are "unresolved", the process and attitudes around reporting incidents has vastly improved.
The comments follow a Herald investigation into the resolution of reported violent sex crimes, which found 2400 cases went "unresolved" in 2016.
Each unresolved case means police believe an assault occurred, but an offender was never charged and taken to court for that crime.
Since 1994, official data says almost 14,000 aggravated sexual assaults in total were unresolved. However, the Herald can reveal that, because an unknown swathe of sex crimes were categorised in a way that meant they were effectively removed from statistics, the true number of unresolved cases over the past 25 years is likely to be thousands more.
According to current police data analysed by the Herald, as of 2016 up to 80 per cent of reported aggravated sexual assaults go unresolved. For the crime "male rapes female 16 and over", that number is even higher, at 85 per cent. Rape cases are four times less likely to go to court in comparison with other types of physical assault, where only 24 per cent of offences are unresolved.