Environmental officers were last night sifting through materials found among syringes and needles dumped in a Derry lane way.
It is believed that personal details such as addresses and receipts and even a food diary have been spotted among the rubbish.
Derry City Council officers are now trying to establish where the syringes and needles- believed to have been used for injecting steroids- and other rubbish linked to fitness and nutrition activity came from.
The items were discovered by shocked workers arriving at Pennyburn Industrial estate on Friday.
The bin liners full of rubbish had been discarded close to the city’s Dog Pound and a number of other businesses.
The Pennyburn Recyclling and Amenity Site is just yards away, and St Mary’s College are also close by.
It is understood special safety measures had to be taken before the rubbish could be collected.
A spokesperson for Derry City Council confirmed last night: “The offending items have been removed.
“The Council is still reviewing the contents of the waste with a view to collating evidence to identify the person(s) responsible and initiate appropriate enforcement action.”
She added: “Any details of any enforcement will be provided to members of the Environmental Services Committee in due course.”
One of those who came across the rubbish on Friday, said at the time: “There is a lot of anger here. There is empty boxes of steroids and syringes among this stuff.
“The person who has done it seems to have left a lot of evidence,”