Hello David
Yes you can, but in general it is difficult to find an RLQ message and identify it as such. An RLQ message is simply a BPDU. There is no way of distinguishing it from other BPDUs just by looking at the contents of the BPDU. RLQ BPDUs are control BPDUs that contain within the actual BPDU payload, TLVs (Type-Length-Values) that allow a switch to identify the BPDU as such. So you may be seeing RLQ BPDUs but you may simply not know that they are RLQ BPDUs.
I hope this has been helpful!
Laz