Fair enough. According to Wikipedia:
Hyoscine is in the antimuscarinic family of medications...
Because of a number of undesirable side effects, scopolamine was shortly disqualified as a "truth" drug. Among the most disabling of the side effects are hallucinations, disturbed perception, somnolence, and physiological phenomena such as headache, rapid heart, and blurred vision, which distract the subject from the central purpose of the interview. Furthermore, the physical action is long, far outlasting the psychological effects.
It can give hallucinations. As a psychoactive agent, it's in the same larger nomenclature of hallucinogen.
You're right, it is usually not classified as a psychedelic, nor as a dissociative, but rather as a deliriant:
Naturally occurring deliriants are found in plant species such as Atropa belladonna (deadly nightshade), various Brugmansia species (Angel's Trumpets), Datura stramonium (Jimson weed), Hyoscyamus niger (henbane), and Mandragora officinarum (mandrake) in the form of tropane alkaloids (notably atropine, scopolamine, and hyoscyamine).
Maybe I should have used the word drugs instead of psychedelics in my last paragraph.
Again on Wikipedia, the full scope of the drugs used in Project MKUltra seems rather vague:
MKUltra used numerous methods to manipulate people's mental states and alter brain functions, including the surreptitious administration of drugs (especially LSD) and other chemicals, hypnosis,[citation needed] sensory deprivation, isolation and verbal abuse, as well as other forms of psychological torture.