Knife crime is one of the most significant social issues facing a whole generation of young people.
Despite children and teenagers too often being caught up in violence, either as victims or perpetrators, an ITV News investigation has shown websites delivering potentially lethal weapons without carry out any legal age checks - or asking for ID when the parcel is dropped off.
What is the law on buying a knife?
- It is illegal to sell knives to people under the age of 18 if the blade is longer than four inches.
- Knives that are bought online are only supposed to be collected in person with valid photographic ID.
This knife was bought online with a debit card that any 16 year old could apply for. No legal age checks were carried out during purchase, and the parcel was simply left on a doorstep.
We showed the knife to a leading surgeon, who said it was "designed to kill".
And it's not just an issue online.
We joined Lancashire Police as they carried out a series of test purchases in Blackburn and Darwen.
Two 17 year old volunteers visited 9 shops - 4 of which sold them knives without asking for any ID.
Shopkeepers told us they thought the buyers were over the legal age.
They won't face any legal action, but were visited by officers to provide education and training to staff.