Scorpio & 8th house – Represents illegality,hidden things & scandal.
Planets Seated in Scorpio sign or in 8th house in its dasha or age wise activation give legality issues.
It is so because when you are in dasha of scorpio and 8th house it makes one isolate and one tends to be an introvert or mute as one has lot of self doubts,directionless and gets entangled in it due to ketu effect.
Slowly as dasha progresses one gets lost and appears to be hidden or cut down from the social ties.
And then when person realises that no one is watching them get the ideas to transform ,experiment ,research and to do shady ,illegal or scandalous things if there’s an affliction to scorpio.
Case 1
Below is the chart of a person he is working at some good power position and is married has two kids :-

He has Rahu Saturn in 6th house of job in leo sign and he has Venus in Scoprio sign showing some illegality in relationship/unaccepted relationship .
He is running Saturn dasha which is with rahu and shows person obsession for power,authority and fame.As leo is also sign of romance – person will tend to break the boundaries in love and relationship at workplace .
Moreover mercury as 7th lord represents tendency to date someone younger.
During saturn/mercury period –he met a girl in his office who used to work under him and has good age gap of 18 years.
As soon as Saturn/Venus started person got involved in intimate relationship.
As I saw the chart I predicted him same thing but he denied but as in D10 Venus and rahu both conjuncted in 6th house had further confirmed and gave a surety that some issues in workplace due to some lowly relationship exists.But later got confirmation of the same from his close acquaintance.
Case 2
Below is the Chart of A Guy who is in Sun Mahadasha and Sun is in 5th house of love and relationship in Aries Rashi and its in 5th house in Scorpio Navamsa of hidden and Illegal things showing illegal and hidden Romantic Relationship.

This guy came for a career consultation and he is a very simple guy and one cannot judge from his simplicity that he can be even in relationship.
But as I saw his Navamsa – “I asked him if you have been approached by some married lady or divorced lady for the relationship and you pursued it as Well during Sun/Moon period.”
As Sun is conjunct With Saturn and Venus in Scorpio Navamsa – that’s why I asked him married lady or divorced as Saturn is karaka of Second hand things and experienced beings. So Sun- Saturn or Venus – Saturn or Venus in Saturn Navamsa in their Dasha* gives a Spouse/Partner which has been divorced or been in a long relationship with someone and later got separated.
After few Moments of Silence the guy has admitted that he has been in a relationship with his subordinate /Colleague and she has been already married to someone else and he is still in relationship with her and there is good age gap as well.