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People tagged are placed under strict conditions as part of their punishment.
This can include having to remain in a specific area or sticking to a curfew. If someone breaches their conditions, it can result in a formal warning, being taken back to court, or an immediate return to prison.
Earlier this year, the Ministry of Justice announced plans to significantly expand electronic monitoring as part of the Sentencing Act 2026, which aims to ease prison pressures by managing more offenders in the community.
Thousands more prisoners may be released early from autumn this year as part of the new law. Reports suggest killers, rapists and sex offenders could be among them. Most will require tagging.
Several probation officers have told the BBC they are worried about how they will cope.
Probation officers are responsible for checking offenders are following the terms of their release from prison. This could include things such as wearing ankle tags or not taking drugs.
"The report makes clear we're overworked. And it's only going to get worse with more people set to do their punishment in the community," one probation officer said.
"There aren't enough of us, and we have no idea how the government is going to make it work so that nobody is at risk. Because something bad will happen, someone who is dangerous and isn't monitored will kill someone," the probation officer added.
The NAO says that part of the problem is a shortfall of around 2,200 full time probation officers, which the government expects to reduce to around 1,500 by September of this year.
The watchdog also says even though the security contractor Serco - which manages the tagging system for the government - met its 95% timeliness target for tag fitting visits, "it was only successful in fitting tags on 62% of the individuals it visited within its two attempts".
The BBC has approached Serco for comment.
The NAO is calling on the government to improve data quality and management of the monitoring system.
It added the government had been working with Serco to improve performance and reduce the backlog in fitting tags.
Ministers estimate a further 22,000 people per year will need to be tagged from 2027.
"The government needs to improve the service's resilience and efficiency, otherwise expanding electronic monitoring risks wasting public money and puts public safety at risk", said Sir Geoffrey Clifton-Brown, chair of the Committee of Public Accounts.
The Ministry of Justice said the government inherited "a failing tagging system with record backlogs".
"As this report shows we have worked hard to fix this, with install rates up by nearly 50% since 2024," it said.
"This is in addition to our record £700m investment in probation, recruiting 2,300 trainee probation officers over the last two years, and recruiting a further 1,300 this year - making sure the Probation Service has the resource it needs to keep dangerous offenders under closer surveillance than ever before."
