Sure, Accra has A Criminal Investigations Department(CID) at the Ghana Police Service. They have some rudimentary training on forensics, though not quite as sophisticated as those in the teams of the "CSI:" trilogy.
But let's have fun anyway.
Supposing there was CSI:Accra, this case would be an open-and-shut case with minimum use of epitheleals. We'd see a cotton swab dabbed into that "liquid" on the tyre, have the swab sprayed -- only to realise it does not come out red, meaning no sign of blood.
A quick smell of the tyre by police dogs would blow the case wide open...they would probably wag their tail -- like Brian, of Family Guy fame, does -- when he's excited, even while still being the intellectual he is.
While there might be no Grissom equivalent to deliver a witticism, there might be a collective groan that it's only dog pee!
Have yourself a great and humour-filled weekend!;-)