Can I access the previous value of a field in deluge?

Can I access the previous value of a field in deluge?

For instance, can I have a workflow rule that is triggered on field update, and then in script access the "before" value of that field?

That is, the value that existed before the user updated the field as well as the 'current' value that the user has changed the field to?

EXAMPLE:

Workflow rule triggered by field update in Leads module, for the field 'Lead Status'.

A record has Lead Status set as Inactive, then a user changes this field to 'Active'. That triggers my custom function, but is there a way that function can check to see that the field used to be set to 'Inactive', before being set to its current value of 'Active'?