Chloroform?
You think that was used? In PDL?
Wouldn't it be a little bit hard to buy it anywhere in Algarve let alone PDL.
If this was the case then this chloroform would have been brought in from somewhere else and whoever took Madeleine would then disappear together with her.. SY and PJ would know through the phone records if anyone left PDL and never came back..
Taken form Wikipedia under "Chloroform"
Inadvertent formation of chloroform
The haloform reaction can also occur inadvertently in domestic settings. Bleaching with hypochlorite generates halogenated compounds in side reactions; chloroform is the main byproduct.[19] Sodium hypochlorite solution
(chlorine bleach) mixed with common household liquids such as acetone, butanone, ethanol, or isopropyl alcohol can produce some chloroform, in addition to other compounds such as chloroacetone or dichloroacetone.
Anyone cleaning swimming pools would have a supply of chlorine.
RM had a key to a garage owned by his partner's estranged hubby which contained the necessary substance.