Some of the world's biggest venues, including Manchester Arena, are not able to detect large knives.
The company claims to be able to detect all weapons.
According to documents shared by the research firm, they may not be able to detect certain types of knives.
Evolv told the British Broadcasting Corporation that it had told all the venues.
There needs to be more public information and more independent evaluation of these systems before they are rolled out in the UK.
They are potentially replacing methods of metal detection that have been tried and tested.
Evolv says that machine learning and artificial intelligence enable the scanning to create unique "signatures" of weapons that differentiate them from other items.
Peter George said last year that they have tens of thousands of signatures for all the weapons that are out there.
Independent security experts have questioned some of the claims made by Evolv.
The company refused to allow the testing of its technology.
The National Center for Spectator Sports Safety and Security was given the go-ahead last year.
The public report published by NCS4 gave Evolv a score of 2.84 out of a possible 3 - many types of guns were detected 100% of the time.
A private report, obtained via a Freedom of Information request, was shared with the media.
It gave Evolv a score of just 1.3 out of 3 for detecting large knives.
Evolv Express couldn't detect large knives 42% of the time.
The system couldn't detect every knife on the sensitivity level observed during the exercise.
It's a good idea to give full transparency to potential customers.
The system did not detect certain types of knives when they were brought through. That conflict with what Evolv has said to the public.
What types of large knives the technology failed to detect is not being reported by the media.
The documents suggest that it may fail to detect certain types of bombs and their components.
The use of Evolv Express at Manchester Arena is the first of its kind in Europe, and it will be rolled out to other arenas.
A man blew up a bomb at an Ariana Grande concert, killing 22 people and wounding hundreds of others.
An official from ASM Global was asked if the private report's conclusions had been passed on.
Employees of Evolv were allowed to make "tracked changes" to the report, according to emails.
The conclusion that "knives were not consistently detected" was deleted.
A reference to the system being incapable of detecting every knife was deleted by an Evolv employee.
NCS4 said it didn't allow Evolv to directly edit the report.
The track changes feature was used to collect feedback.
The process of NCS4 has proven to be effective in educating solution providers.
The private report's conclusions were not disputed.
"We communicate sensitive security information, including the capabilities and limitations of our system, so that security professionals can make the most informed decisions for their specific venue."
Venues will be less safe because of how we get around security screening and technology to the public.
Very little is known about how well Evolv technology works.
The Centre for the Protection of National Infrastructure is part of the Home Office.
The Home Office wouldn't confirm or deny this.
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